HP Designjet Z6200 Photo Printer - Manual (Page 105)

1. All colors
2. Computer monitor gamut
3. CMYK press gamut
Some color spaces are not device-dependent, but instead represent how a viewer sees colors, such as
CIE Lab or CIECAM02. These color spaces are defined by the CIE (Commission Internationale de
l’Éclairage). The advantage of these spaces is that if two objects have the same CIELAB values, they
look the same when viewed under the same conditions. Values in these spaces can be obtained from
measuring the light emitted or reflected by an object.
The solution: color management
Many colors from an RGB-controlled device cannot be reproduced in a CMYK-controlled device, and
vice versa. These colors are called “out-of-gamut” colors.
1. Describe the color behavior of a device as accurately as possible by using an ICC
profile. The color behavior of a device can be described by taking various RGB or CMYK
combinations, sending them to a device, measuring the resulting output, and expressing it in a
device-independent color space (for example, CIE Lab). The resulting relationship is stored in an
ICC profile, which is a standard file that translates the color space of a device(CMYK or RGB) to a
device-independent color space (for example CIE Lab). The process of generating an ICC profile is
called profiling.
2. Convert colors as effectively as possible by using a Color Management System
(CMS). A CMS is software that uses information from ICC profiles to transform the color space of
one device (defined by a source profile) into the color space of another device (defined by a
destination profile). In this solution, difficulties arise with the colors that exist in the gamut that one
device uses and that the other does not use.
The following four settings describe a CMS:
ENWW The solution: color management 97
Color management