The range of colors that can be represented by a particular color space is called its
gamut. Disparity between the gamuts of sRGB and CMYK color spaces is a source of
continual frustration to graphic designers and computer artists, because printed
images can never perfectly match screen images.
It??™s important to keep in mind that we??™re dealing with the perception of color, since
there are few absolutes when dealing with the human eye. Consider a projection
screen: when first unrolled, most people will tell you that the screen is white. But if
you use a video projector to project a presentation slide with a few bright words onto
the screen and ask the viewers what color the background is, those same people will
tell you that the background is black, despite the fact that it is just as brightly lit as
when they said it was white!
9.2 Visuals
When you use xdpyinfo to view the properties of an X server, you will see a number
of visuals listed:
number of visuals: 80
default visual id: 0x21
visual:
visual id: 0x21
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x22
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
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