Blame Manuals/en/LaTeX/Concepts/Identity/themes.tex

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% Part   : Concepts
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% Chapter: Corporate Identity
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% ------------------------------------------------------------
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% $Id: themes.tex 6207 2010-08-05 13:11:13Z al $
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% ------------------------------------------------------------
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\section{Themes}
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\hypertarget{sec:Concepts:Identity:Themes}{}
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\label{sec:Concepts:Identity:Themes}
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\begin{description}
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\item[framework:] trunk/Identity/Themes/
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\end{description}
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\noindent Here is where themes are produced.  In the above framework
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location, themes are organized in ``Models'' ---to store common
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information--- and ``Motifs''---to store unique information.  At
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rendering time, both motifs and models are combined to produce the
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final CentOS themes. CentOS themes can be tagged as ``default'' or
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``alternative''. 
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CentOS themes are maintained by CentOS community. 
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% ------------------------------------------------------------
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\section{CentOS Default Theme}
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\hypertarget{sec:Concepts:Identity:Themes:Default}{}
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\label{sec:Concepts:Identity:Themes:Default}
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The CentOS default theme is used in all visual manifestations of
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CentOS Project's corporate visual identity (e.g., distributions, web
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sites, promotion, etc.).
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Changing CentOS default theme is not very convenient because that
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affects the ``recognition'' of CentOS Project.  Nevertheless, we are
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interested on seeing your art work propositions.  Specially if your
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art work is an improvement to the base idea behind CentOS default theme
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(\textbf{Modern}, squares and circles flowing up.).
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If you are not happy with CentOS default theme, you can look inside
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CentOS alternative themes and download the one you are interested in.
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If you are not happy with any of the CentOS alternative themes
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available, then go and design your own CentOS alternative theme as
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described in ``\hyperlink{sec:Concepts:Identity:Themes:Motifs}{Theme
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Motifs}'' (\autoref{sec:Concepts:Identity:Themes:Motifs}).
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% ------------------------------------------------------------
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\section{CentOS Alternative Themes}
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\hypertarget{sec:Concepts:Identity:Themes:Alternative}{}
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\label{sec:Concepts:Identity:Themes:Alternative}
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CentOS alternative themes exist for people how want to use a different
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visual style on their installations of CentOS distribution. As the
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visual style is needed for a system already installed components like
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Anaconda are not required inside alternative themes. Inside
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alternative themes you find post-installation visual style only (i.e.
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Backgrounds, Display Managers, Grub, etc.).  CentOS alternative themes
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are maintained by CentOS Community.
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% ------------------------------------------------------------
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\section{Theme Transition}
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\hypertarget{sec:Concepts:Identity:Themes:Transition}{}
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\label{sec:Concepts:Identity:Themes:Transition}
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Theme transition is the action of moving a theme from alternative to
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default.  This transition begins when an alternative theme gets
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popular enough inside CentOS Comminity, and both CentOS Administrators
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and CentOS Comunity Members want to extend it to all CentOS Visual
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Manifestations. 
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Once the popular alternative theme has been extended through all
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CentOS visual manifestations, the alternative theme implementation
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phase starts. The alternative theme implementation phase is where
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default theme art work is replaced with alternative theme ones. After
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the implementation phase, the previous default theme is tagged as
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alternative and the implemented alternative as default.
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Theme Transition has a huge impact in CentOS Corporate Visual
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Identity, it should be done only if absolutly necessary. Generally, it
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is better to improve the current default theme, based on its concept,
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than create a completly new one. 
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% ------------------------------------------------------------
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\section{Theme Models}
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\hypertarget{sec:Concepts:Identity:Themes:Models}{}
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\label{sec:Concepts:Identity:Themes:Models}
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\begin{description}
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\item[framework:] trunk/Identity/Themes/Models/
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\end{description}
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\noindent Here is where theme models are stored.  Theme models let you
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modeling characteristics (e.g., dimensions, translation markers,
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position of each element on the display area, etc.) common to all
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themes.  Theme models let you reduce the time needed when propagating
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artistic motifs to different visual manifestations.
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\begin{figure}[!hbp]
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\hrulefill
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\begin{verbatim}
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trunk/Identity/Themes/
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|-- Models
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|   |-- Default             <-- theme's model name.
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|   |   |-- Distro
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|   |   |   |-- Anaconda
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|   |   |   |   |-- Header
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|   |   |   |   |-- Progress
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|   |   |   |   |-- Prompt
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|   |   |   |   `-- Splash
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|   |   |   `-- BootUp
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|   |   |       |-- Firstboot
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|   |   |       |-- GDM
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|   |   |       |-- GRUB
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|   |   |       |-- GSplash
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|   |   |       |-- KDM
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|   |   |       |-- KSplash  
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|   |   |       |-- RHGB
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|   |   |       `-- Plymouth
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|   |   |-- Promo
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|   |   |-- Web
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|   |-- Alternative        <-- theme's model name.
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|   |   |-- Distro
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|   |   |   `-- BootUp
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|   |   |       |-- Firstboot
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|   |   |       |-- GDM
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|   |   |       |-- GRUB
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|   |   |       |-- GSplash
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|   |   |       |-- KDM
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|   |   |       |-- KSplash  
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|   |   |       |-- RHGB
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|   |   |       `-- Plymouth
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|   |-- ... more theme models.
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\end{verbatim}
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\hrulefill
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\caption{Theme models structure.%
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   \label{fig:Concepts:Identity:Themes:Models}}
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\end{figure}
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Theme models serves as a central pool of design templates for themes
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to use. This way you can produce themes with different artistic motifs
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but same characteristics.
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Inside the framework location above, you find theme models organized
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by name. You can add your own theme models to the structure by adding
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a directory to the list. By default you have the following
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ready-to-use theme models:
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\begin{itemize}
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\item \textbf{Default:} Stores the theme model used to produce
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``\hyperlink{sec:Concepts:Identity:Themes:Default}{CentOS
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Default Theme}''
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(\autoref{sec:Concepts:Identity:Themes:Default}). 
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\item \textbf{Alternative:} Stores the theme model used to produce
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``\hyperlink{sec:Concepts:Identity:Themes:Alternative}{CentOS
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Alternative Themes}''
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(\autoref{sec:Concepts:Identity:Themes:Alternative}). 
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\end{itemize}
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\begin{figure}
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\begin{center}
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\fbox{\includegraphics[width=0.8\textwidth]{%
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   /home/centos/artwork/trunk/Identity/Models/Img/en/Corporate/common-design-model-fig1.pdf}}
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\end{center}
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\caption{Anaconda theme model producing three different visual
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styles.}
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\end{figure}
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\begin{figure}
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\begin{center}
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\fbox{\includegraphics[width=0.8\textwidth]{%
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   /home/centos/artwork/trunk/Identity/Models/Img/en/Corporate/common-design-model-fig2.pdf}}
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\end{center}
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\caption{Firstboot theme model producing three different visual
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styles.}
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\end{figure}
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% ------------------------------------------------------------
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\section{Theme Motifs}
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\hypertarget{sec:Concepts:Identity:Themes:Motifs}{}
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\label{sec:Concepts:Identity:Themes:Motifs}
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\begin{description}
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\item[framework:] trunk/Identity/Themes/Motifs/
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\end{description}
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\noindent Here is where the themes' artistic motifs are produced. The
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artistic motif is a graphic design used as common pattern to connect
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all CentOS Project's visual manifestations inside the same theme.
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Inside the framework location above, artistic motifs are organized by
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names inside the standard file structure illustrated in
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\autoref{fig:Concepts:Identity:Themes:Motifs:Default} and
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\autoref{fig:Concepts:Identity:Themes:Motifs:Alternative}.
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\begin{figure}[!hbp]
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\hrulefill
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\begin{verbatim}
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trunk/Identity/Themes/
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|-- Motifs
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|   |-- Modern              <-- theme name.
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|   |   |-- Backgrounds
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|   |   |-- Distro
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|   |   |   |-- Anaconda
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|   |   |   |   |-- Header
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|   |   |   |   |-- Progress
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|   |   |   |   |-- Prompt
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|   |   |   |   `-- Splash
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|   |   |   |-- BootUp
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|   |   |   |   |-- Firstboot
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|   |   |   |   |-- GDM
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|   |   |   |   |-- GRUB
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|   |   |   |   |-- GSplash
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|   |   |   |   |-- KDM
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|   |   |   |   |-- KSplash  
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|   |   |   |   |-- RHGB
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|   |   |   |   `-- Plymouth
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|   |   |   `-- Desktop
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|   |   |-- Info
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|   |   |-- Palettes
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|   |   |-- Promo
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|   |   |-- Screenshots
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|   |   `-- Web
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|   |-- ... more theme names.
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\end{verbatim}
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\hrulefill
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\caption{Theme motifs default structure.%
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   \label{fig:Concepts:Identity:Themes:Motifs:Default}}
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\end{figure}
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\begin{figure}[!hbp]
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\hrulefill
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\begin{verbatim}
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trunk/Identity/Themes/
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|-- Motifs
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|   |-- TreeFlower          <-- theme name.
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|   |   |-- Backgrounds
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|   |   |-- Distro
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|   |   |   |-- BootUp
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|   |   |   |   |-- Firstboot
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|   |   |   |   |-- GDM
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|   |   |   |   |-- GRUB
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|   |   |   |   |-- GSplash
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|   |   |   |   |-- KDM
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|   |   |   |   |-- KSplash  
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|   |   |   |   |-- RHGB
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|   |   |   |   `-- Plymouth
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|   |   |   `-- Desktop
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|   |   |-- Info
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|   |   |-- Palettes
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|   |   |-- Screenshots
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|   |-- ... more theme names.
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\end{verbatim}
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\hrulefill
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\caption{Theme motifs alternative structure.%
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   \label{fig:Concepts:Identity:Themes:Motifs:Alternative}}
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\end{figure}
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When designing artistic motifs for CentOS, consider the following
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recommendations:
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\begin{itemize}
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\item Give a unique (case-sensitive) name to your Motif. This name is
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used as value wherever theme variable (\$THEME) or translation marker
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(\texttt{=THEME=}) is.  Optionally, you can add a description about
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inspiration and concepts behind your work.
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\item Use the location trunk/Identity/Themes/Motifs/\$THEME/ to store
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your work. If it doesn't exist create it. Note that this require you
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to have previous commit access in CentOS Artwork Repository.
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\item The CentOS Project is using the blue color (\texttt{\#204c8d})
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as base for its corporate visual identity. Use the CentOS Project's
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base corporate color as much as possible in your artistic motif
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designs.
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\item Try to make your design fit one of the
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``\hyperlink{sec:Concepts:Identity:Themes:Models}{Theme Models}''
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(\autoref{sec:Concepts:Identity:Themes:Models}).
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\item Feel free to make your art enterprise-level and beautiful.
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\item Add the following information on your art work (both in a visible
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design area, and inside Inkscape's document metadata section wherever
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it be possible):
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\begin{itemize}
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\item The name (or logo) of your artistic motif.
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\item The copyright sentence: \texttt{Copyright (C) YEAR YOURNAME}
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\item The license under which the work is released. All CentOS Art
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works are released under
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\href{http://creativecommons.org/licenses/by-sa/3.0/}{Creative Common
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Share-Alike License 3.0}
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(\href{http://creativecommons.org/licenses/by-sa/3.0/}{http://creativecommons.org/licenses/by-sa/3.0/}).
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\end{itemize}
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\end{itemize}
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% ------------------------------------------------------------
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\section{Theme Palettes}
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\hypertarget{sec:Concepts:Identity:Themes:Palettes}{}
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\label{sec:Concepts:Identity:Themes:Palettes}
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\begin{description}
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\item[framework:] turnk/Identity/Themes/Motifs/\$THEME/Palettes/\\
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\end{description}
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\noindent Here is where graphic designers define theme palettes for
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color-limited art works. Theme palettes contain the color information
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that rendering functions need, in order to produce images with color
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limitations.  Theme palettes contain theme's unique color information.
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\autoref{tab:Concepts:Identity:Themes:Palettes:Files}.
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% ------------------------------------------------------------
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\section{Theme Palettes Creation}
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\hypertarget{sec:Concepts:Identity:Themes:Palettes:Creation}{}
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\label{sec:Concepts:Identity:Themes:Palettes:Creation}
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Theme palettes are based on art works' specific color information you
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are creating palettes for. As we write this section, there are two art
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works that require color limitations. They are Grub and Syslinux art
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works.
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This section describes a generic procedure you can use to create theme
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palettes for art works which need to be produced with color
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limitations.
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\begin{enumerate}
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\item As first step, you need to produce a PNG file with the final
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design of that art work you are creating palettes for.  You can do
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this by using the \texttt{render.sh} script available in the art
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work's identity framework.
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\item Secondly, you need to generate the limited color information for
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that PNG file the three different file formats (See
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\autoref{tab:Concepts:Identity:Themes:Palettes:Files}). You can do
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this by using the Gimp as described below: 
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\begin{table}[!hbp]
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\center
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\begin{tabular}{ll}
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\hline
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\textbf{File} & \textbf{Description}\\
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\hline
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\texttt{.gpl} & Gimp palette files.\\
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\texttt{.ppm} & Portable Pixel Map palette files.\\
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\texttt{.hex} & Hexadecimal auxiliar palette files.\\
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\hline
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\end{tabular}
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\caption{Palette file types.% 
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   \label{tab:Concepts:Identity:Themes:Palettes:Files}}
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\end{table}
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\end{enumerate}
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To create the \texttt{.gpl} file:
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\begin{enumerate}
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\item Open the Gimp (\textit{Applications / Graphics / The Gimp}).
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\item Open the PNG format file you want to generate the limited color
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information for (\textit{File / Open ...}).
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\item Index the image (\textit{Image / Mode / Indexed...}).  This will
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open the window ``Indexed Color Conversion''. Use this window to
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``Generate optimum palette'' by setting the maximum number of colors
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you want to have in the final indexed image. In this window, by the
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default, Gimp has set 255 as the maximum number of colors, you should
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change this value to fit the art work color limitation requirements
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(i.e. 14 colors for Grub's splash, and 16 colors for Syslinux splash,
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etc.). Another option you can play with is ``Color dithering'' at the
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window's bottom, particularly the ``Floyd-Steinberg (reduced color
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dithering)'' option which seems to archive the best results.
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\item At this point you have reduced color information and indexed the
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image. This let you save the color information as a Gimp palette file
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(.gpl) for further using. 
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To export the color information as Gimp palette you need to open the
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palette window (\textit{Ctrl+P}) and go to the action ``Import
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Palette...'' inside ``Palettes Menu''. This will open the window
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``Import Palette''. In this window you need to specify the source from
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where you will retrive color information and the name of the palette
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file. Use ``Image'' as source to create your palette and the
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appropriate name (e.g., \texttt{centos-\$themename-grub}).\footnote{in
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\texttt{centos-\$themename-grub} file name, the \texttt{\$themename}
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part is the theme's name you are working on (e.g., Modern, TreeFlower,
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etc.) for Grub's palette, \texttt{centos-\$themename-syslinux} for
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Syslinux palette, etc.}
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\end{enumerate}
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To create the \texttt{.ppm} file:
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\begin{enumerate}
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\item Use the Gimp to create a new image (\textit{Ctrl+N}) of 16 x 1
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pixels of dimension.  That is 16 pixels width and 1 pixel height.
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\item That is a rather small image so you problably want to zoom it in
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to better see what you are doing. In a 1024x768 screen resolution,
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zoom the 16 x 1 pixel image to 4500\% makes things clear enough. If
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you are using a different screen resolution you probably need to zoom
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in to a different value. 
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\item Now it's time to fill up the empty image with the color
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information we created previously. You do this using the pen tool
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(\textit{N}) with a 1x1 brush (\textit{Shit+Ctrl+B}). At this point it
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is a good time to open the ``Palette Editor'' window and use the Gimp
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palette file with the color information we created (\textit{Ctrl+P /
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doble click on the palette file}).
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\begin{quote} 
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\textbf{Caution!:} If you are creating \texttt{.ppm} palettes for
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Anaconda prompt (syslinux), the order used to set the color
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information is relevant. Relevant values in the image are positions: 0
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and 7.  Position 0 is used as background color, which is black
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(\texttt{\#000000}) generally and position 7 is used as forground
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color, which is white (\texttt{\#ffffff}) generally. This, in order to
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grant the highest contrast.  See
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\autoref{fig:Concepts:Identity:Themes:Palettes:Syslinux}.
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\end{quote}
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\end{enumerate}
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To create the (\texttt{.hex}) file:
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\begin{enumerate}
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\item Create a plain text file and put the hexadecimal color
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information and its index position defined in \texttt{.ppm} palette
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inside the file, one definition by line.  The format used to create
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the \texttt{.hex} file is \texttt{\#rrbbgg=i \dots}.  Where
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\texttt{\#rrggbb=i} indicates that the color \texttt{\#rrggbb} (hex)
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should be assigned index i (decimal).
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\begin{quote}
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\textbf{Caution!:} In order to produce Anaconda prompt (syslinux)
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images correctly, both \texttt{.hex} and \texttt{.ppm} color and index
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information should match.
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\end{quote}
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\end{enumerate}
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\begin{figure}[!hbp]
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\begin{center}
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\fbox{\includegraphics[width=0.8\textwidth]{%
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   /home/centos/artwork/trunk/Identity/Models/Img/en/Distro/Anaconda/Prompt/syslinux-palette.pdf}}
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\end{center}
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\caption{Palette's background (A) and forground (B) color position.%
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    \label{fig:Concepts:Identity:Themes:Palettes:Syslinux}}
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\end{figure}
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% ------------------------------------------------------------
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\section{Theme File Structure}
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\hypertarget{sec:Concepts:Identity:Themes:Files}{}
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\label{sec:Concepts:Identity:Themes:Files}
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Inside CentOS Artwork Repository, each theme has a name and a
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directory for it. Inside each theme directory, the CentOS Project
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visual style is organized in the directories: Distro, Info, Palettes,
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Promo, Screenshots, and Web. 
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% ------------------------------------------------------------
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\subsection{The \texttt{Distro} Directory}
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\hypertarget{sec:Concepts:Identity:Themes:Files:Distro}{}
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\label{sec:Concepts:Identity:Themes:Files:Distro}
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Here is where image files controlling CentOS Distribution visual style
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are produced. 
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\begin{figure}[!hbp]
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\hrulefill
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\begin{verbatim}
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turnk/Identity/Themes/Motifs/$THEME/Distro/
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|-- Anaconda
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|   |-- Header
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|   |-- Progress
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|   |-- Prompt
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|   `-- Splash
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|-- BootUp
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|   |-- Firstboot
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|   |-- GDM
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|   |-- GRUB
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|   |-- GSplash
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|   |-- KDM
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|   |-- KSplash
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|   `-- RHGB
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`-- Desktop
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\end{verbatim}
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\hrulefill
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\caption{The CentOS distribution theme structure.}
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\end{figure}
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% ------------------------------------------------------------
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\subsection{The \texttt{Palettes} Directory}
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\hypertarget{sec:Concepts:Identity:Themes:Files:Palettes}{}
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\label{sec:Concepts:Identity:Themes:Files:Palettes}
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Here is where theme's palettes are sotred. Palettes are used to
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automate image rendering in cases where a limited amount of color need
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to be specified. Before you could render color-limited art works (e.g.
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Grub, and Syslinux), you need to create their color-limited palettes
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first. See
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``\hyperlink{sec:Concepts:Identity:Themes:Palettes:Creation}{Theme
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Palette Creation}''
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(\autoref{sec:Concepts:Identity:Themes:Palettes:Creation}).
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% ------------------------------------------------------------
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\subsection{The \texttt{Promo} Directory}
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\hypertarget{sec:Concepts:Identity:Themes:Files:Promo}{}
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\label{sec:Concepts:Identity:Themes:Files:Promo}
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Here is where image files controlling CentOS promotion visual style
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are produced.
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% ------------------------------------------------------------
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\subsection{The \texttt{Screenshots} Directory}
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\hypertarget{sec:Concepts:Identity:Themes:Files:Screenshots}{}
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\label{sec:Concepts:Identity:Themes:Files:Screenshots}
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Here is where theme's screenshots are stored. The purpose of this
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directory is to collect theme's implementation graphical history
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through time. Inside this directory you can have distribution
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screenshots, web sites screenshtos, and promotion screenshots. If
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theme has been implemented out of computers like would be the case of
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events, stands, etc. those photos can be added here too, in the
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promotion screenshot section.
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% ------------------------------------------------------------
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\subsection{The \texttt{Web} Directory}
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\hypertarget{sec:Concepts:Identity:Themes:Files:Web}{}
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\label{sec:Concepts:Identity:Themes:Files:Web}
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Here is where image files controlling CentOS Web sites visual style
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are produced.