Entering Cmyk Setup Information; Using Icc ProfiLes To DefiNe The Cmyk Color Space - Adobe PHOTOSHOP 5.0 User Manual

86 CHAPTER 5
Reproducing Color Accurately
3 For Primaries, choose a set of red, green, and
blue phosphor or primary types. This option is
based on the different red, green, and blue
phosphors or primaries used by monitors to
display color. If the correct type is not listed,
choose Custom, and enter the red, green, and blue
chromaticity coordinates.
Note: Because you are defining the color space in
which to edit images, the primaries do not have to
match your monitor.
To save and load the settings for different RGB color
spaces:
Select Save or Load in the RGB Setup dialog box.
Saving the setting saves it as an ICC profile.
Note: Only RGB profiles that exactly match
Photoshop's RGB model can be loaded. They must be
matrix-based, and use a single, pure-gamma tone
response curve. Most RGB profiles are not supported
as a working RGB space.
Entering CMYK setup
information
The CMYK Setup dialog box lets you define the
CMYK color space using ICC profiles, color
separation tables, or by specifying the properties of
the inks and paper stock used to reproduce your
color plates.
As with the RGB Setup dialog box, Photoshop uses
information in the CMYK Setup dialog box when
converting color values between modes. If you
change the CMYK Setup settings after you have
converted an image to CMYK mode, only the
display is affected. You must revert to the original
RGB image (by choosing File > Revert) and then
reconvert the image for the changes to affect the
separation data. See "Converting to CMYK" on
page 97, for more information on how the
printing inks settings affect mode conversions.
If you are using an RGB-based printer (such as
most low-end inkjet printers, some thermal
printers, and some high-end proofing devices,
such as Fujix Pictography), you don't need to enter
CMYK setup information. Such printers use RGB
information, not CMYK information, to print the
file. If you are unsure whether your printer is an
RGB printer, see the documentation that came
with your printer or contact the printer's
manufacturer. All options for managing color in
RGB-based output devices are in the Print dialog
box. For more information, see "Converting the
color space of images while printing" on page 338.
To specify the CMYK settings:
Do one of the following:
To use an ICC profile to define the CMYK color
•
space for your printer, see "Using ICC profiles to
define the CMYK color space" on page 87.