[scribus] black = gray?

[Pierre Marchand]

Vous (Femke Snelting) avez écrit :
> Still a bit puzzled

I must have been unclear! 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.

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.

And yes, it could be documented somewhere else than in IRC logs :-)

PS: you can read PDF documents with PoDoFoBrowser (and PDF reference opened), 
which is simply great!

-- 
Pierre Marchand