MX-PEX1 (serv.man12). Fiery PEX1 Colour Reference Guide - Sharp Copying Equipment User Guide / Operation Manual. Page 27

The methods and options available for defining colors depend on the type of PostScript 
application that you are using.

Photoshop

Choose colors in Photoshop with various color models, including 
HSB, CIE Lab, RGB, and CMYK. 

Page layout 
application

Page layout applications generally use the CMYK color model. Some 
allow you to define colors with other color models and may be able 
to send that data to the Color Server in those other color models. 
Generally, however, CRDs

(which affect only RGB data) do not 

affect colors defined in page layout applications. 

For predictable results with CMYK colors, use the CMYK Color 
Reference when defining colors in page layout applications (see 

Illustration 
application

All illustration applications use the CMYK color model. Although 
you may be allowed to define colors using other color models, these 
applications generally send only CMYK data to the Color Server. 

For predictable results with CMYK colors, use the CMYK Color 
Reference pages when defining colors (see 

Different versions of Illustrator support color models slightly 
differently (see