An alternative to making a group of settings as described in these paragraphs
is to purchase or build a color separation table. Available from a variety
of suppliers, tables are mathematical process matrices that feed Photoshop
software the numbers it needs for both RGB-to-CMYK conversions, and the
opposite. Since the display of CMYK files must be performed in RGB, the
purpose of the CMYK-to-RGB table is to filter the file's values through
a look-up-table for monitor values, making the display as reasonable as
possible.
When a separation table is loaded, Photoshop's Ink and Separation set-up
preferences become unavailable.
It's possible to build custom separation set-up tables using a calibration
file provided with Adobe Photoshop software, and following instructions
contained in a technical document published on the Photoshop CD-ROM. With
this calibration document, a separation is completed in another product
and that document opened with Photoshop software, and then the look-up tables
that result are saved and used as a set-up. This technique is useful for
those who prefer the color-separation techniques of another product, and
wish Photoshop software to use the same tables that the other product uses.
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