If you have not set the Use raster image colour
depth
switch in the Raster graphics
part of the dialog, you
have to select a colour depth for all raster graphics here. This is
recommended if, say, you want to export a PS file for a b&w printer.
Even if your document contains many colour images, you should choose
Greyscale
in this case to avoid creating an unnecessarily large
amount of data. This will also reduce the processing time before the
PS file is printed.
Another use: If you want to e.g. convert your PS files to PDF for
screen display only, it might be better not to use CMYK colour depth.
In that case it is better to select TrueColor RGB
.
Note: If CMYK separated
is not selectable, then
this may be due to the fact that you have only activated the Output
PostScript Level 1
switch in this function group. CMYK is
supported in PostScript Level 2 for the first time!
