[scribus] RGB to CMYK not using ICC profile for R=G=B colors

[Gregory Pittman]

On 12/22/2011 11:10 AM, Patrick Noffke wrote:
>>
>>
> Another reason why I think this is incorrect behavior is with respect to
> gradients.  If you create a rectangle with Black R=G=B=0 on the ends, and a
> dark red (for example), with R=75, G= 45, B=45 in the middle, then when you
> make the PDF, the black ends will get K only, and the middle will have
> 4-color, with the CMYK coverage depending on the output intent (for the
> SWOPcoated5_240 TAC profile, the middle red CMYK is (40%, 70%, 36%, 76%)).
>   If you want to print this on a high-quality device, which is capable of
> handling high TAC levels, the black ends will be too light from what the
> author intends.  Or to put it another way, if you work with RGB colors, to
> get a nice saturated black on a high quality device, you have to create a
> color like R=0, G=1, B=0.
>
> What do others think?  I'm happy to file a bug report (with a patch), if
> you think it makes sense to change the behavior.
>
 From time to time, we have this discussion, about what black is, how 
black black is, etc. You might consider whether to use rich black in 
your instance:

http://wiki.scribus.net/canvas/What_is_Rich_Black%3F

but I don't think that Scribus should make this decision for you. If 
someone such as yourself has knowledge of and uses a high-quality 
printer, then you would want to be aware of options, but even then, 
there are various options.

Greg