[scribus] black = gray?
snelting at geuzen.org
Thu Nov 13 13:14:28 CET 2008
> The thing is pretty simple in fact. When you export
> into a "gray level" PDF, colors _are_ translated to fit into this particular
> color space. And, as long as CMYK(0,0,0,100) isn’t the blackest black you can
> obtain in CMYK color space, it’s obviously not mapped to the blackest you can
> get in gray space. On the other side, RVB(0,0,0) is really the blackest thing
> you can get in RVB space.
Yes! we just found the same through trial and error...
> So your options are:
> - set a black as RVB(0,0,0) so it will translate into "0.0 g" when you export
> in gray PDF;
> - set a black as CMYK(100,100,100,100) so it will translate into "0.0 g" when
> you export in gray PDF;
> - set a black as CMYK(0,0,0,100) --- the default one actually --- and export
> as a CMYK PDF so it will be kept unchanged:
> "0.00000 0.00000 0.00000 1.00000 k"
> - or (but I’m a bit unsure even if my understanding and my testing agree!),
> set a black as CMYK(0,0,0,100) _and_ activate black point compensation when
> you export in gray PDF.
We now *almost* understand what is going on ;-) thanks a lot.
> And yes, it could be documented somewhere else than in IRC logs :-)
I will try to document our mess-up next week.
> PS: you can read PDF documents with PoDoFoBrowser (and PDF reference opened),
> which is simply great!
Brilliant. That is really a great tool
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