A Pixel's Color

Add a story on what one would need to know to process and display a
pixel.

This is an introduction to people who are already familiar with computer
graphics in general, images in memory, and maybe window systems, but
never really thought what the values in a pixel actually mean or what
they are doing wrong with them.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
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