Using Icc Profiles To Define The Cmyk Color Space - Adobe PHOTOSHOP 5.0 User Manual

To specify the ink and separation options
•
yourself, see "Using the Built-in option to define
the CMYK color space" on page 88.
To create or use third-party, Photoshop-
•
compatible color separation tables, see "Using
color separation tables" on page 98.
Using ICC profiles to define the
CMYK color space
The CMYK Setup dialog box lets you specify the
CMYK color space based on the ICC profile of the
printer you select. The CMM then maps the colors
in the image to the profiled printer's color gamut,
or range of printable colors.You can choose the
method (called rendering intent) that is used to
translate the colors to the printed gamut.
To use ICC printer profiles to define the CMYK color
space:
Choose File > Color Settings > CMYK Setup.
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2 For CMYK Model, select ICC.
3 Select Preview to display a preview of your
changes. A flashing bar under the option indicates
a preview is being created.
4 For Profile, choose the printer profile you want
to use. If the printer you use is not listed in the
Profile menu, contact your printer manufacturer
for the appropriate printer profile or create one
using third-party printer profiling software.
5 For Engine, choose the CMM you want to use.
Built-in refers to Photoshop's built-in CMM.
Note: This option is not the same as choosing
Built-in for CMYK Model.
6 For Intent, choose one of the following:
Perceptual (Images) to maintain the relative
•
color values among the original pixels as they are
mapped to the printer gamut. This method
preserves the relationship between colors,
although the color values themselves may change.
Saturation (Graphics) to maintain the relative
•
saturation values of the original pixels. Out-of-
gamut colors are converted to colors that have the
same saturation but fall just inside the gamut.
Relative Colorimetric to leave colors that fall
•
inside the gamut unchanged. This method usually
converts out-of-gamut colors to colors that have
the same lightness but fall just inside the gamut.
Absolute Colorimetric to disable white point
•
matching when converting colors. This option is
not generally recommended.
If desired, choose Black Point Compensation to
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map the darkest neutral color of the source's color
space to the darkest neutral color of the desti-
nation's color space rather than to black when
converting colors.
Click OK.
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