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Chapter 5 – Toolboxes
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ICC Profile
The ICC profile is a table that links the color of a device to the universal
color standard employed by the ICC. Thus, color from the camera may
be converted to the color of a display or print device via the universal
color standard. The camera ICC profile converts color to the universal
standard and the print or display device converts from the universal
standard to its device color. The same perceived color is maintained
throughout.
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Lab in ICC
The universal color space employed by the ICC is Lab color. L is
luminance and a and b are Red/Green and Blue/Yellow channels
respectively.
A profile thus enables translation to and from a device-specific RGB
color definition and a Lab color definition.
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Color Gamut
The color gamut is the range of Lab values that a device is able to
produce. A device’s gamut is measured by displaying or printing a file
with all possible combinations of R, G and B. The resulting range of
colors is the device’s gamut. In order to compare and understand the
color gamut, we represent it in the units of the universal color standard
- Lab. The gamuts of different devices may include or intersect each
other. In general, the larger the gamut of a device, the better color it
reproduces.
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RGB Working Space
Adobe Photoshop has introduced the concept of RGB Working Space
for its software needs. It is a virtual monitor space representing an ideal
device which includes many more colors than can be displayed on a real
monitor. The key requirement is that the RGB Working Space includes
the colors that can be printed on paper. For example, Adobe RGB
(1998), Adobe’s recommended RGB Working Space, contains the
gamut of most offset printing processes.
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Camera RGB
The RGB produced by each Leaf camera back is referred to as Camera
RGB. The gamut of any Leaf Camera RGB is larger than any RGB
working space. The closest published RGB working space is Kodak
ProPhoto RGB.