Graphics Programs Reference
In-Depth Information
no gamut boundary associated with a capture device. The device sees
what is placed in front of it, although there is a range of density or
dynamic range that is fixed. There is a level of lightness or darkness that
these devices are capable of capturing. We call this the dynamic range of
a device. With a scanner, the item that is being seen and recorded is a
piece of film, which does have a gamut (both in terms of color satura-
tion and dynamic range). Digital cameras are different beasts and will be
discussed in a later chapter. The crux of the discussion is recognizing that
devices, especially output devices, all have differing abilities in the range
of hue they can reproduce, the maximum saturation, and density or
dynamic range. In a perfect world, all the devices would reproduce all
colors. This is not a perfect world.
One reason I spent some time discussing the work of the CIE, and the
CIE xyY chromaticity diagram, is that such a plotting of color spaces
allows us to see the gamut of a device in the context of all visible colors.
Figure 1-9 shows the color gamut of two color spaces plotted on the CIE
Fig. 1-9 This CIE
chromaticity diagram
shows the gamut of two
color spaces: Adobe RGB
(1998) and a typical
printing press. The entire
diagram indicates the color
gamut visible to the
human eye.
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