[scribus] No real CMYK black possible??
scribus.lists at tisc.de
Mon Jun 23 10:34:23 CEST 2008
On Sun, Jun 22, 2008 at 09:36:31PM -0400, Andrew A. Gill wrote:
> > Thanks, I verified that using my testfile and cmyk colors come out as
> > expected. I can't check the images this way, though. Strange: When I run
> > the EPS file through ghostscript, my 40/40/40/100 black seems to get
> > converted to 0/0/0/100 black - at least I can only see this kind of
> > black in Cinepaint. :-(
> Two things that I forgot to mention:
> 1.) Use postscript, not encapsulated postscript. There shouldn't
> be any difference, but it's better to remove any possibility of
> error. (print to file using postscript)
> 2.) I'm getting a spot color (SpotRich_Black) in my PS outputs.
> Looks to be Rich Black. See below.
Me too. After I unchecked the "registration color" checkbox, the Rich
Black came out as 0.4 0.4 0.4 1 in the EPS as expected. It doesn't come
through to TIFF though.
> And now a third point:
> 3.) I tried printing separations, and I got interesting results.
It looks like ghostscripts eats some colors.
> The black separation shows everything pure black, except the RGB
> black image, which is rather lighter than the rest (to be
> expected). The cyan separation only shows the RGB black and the
> stroke around Total Black. The magenta and yellow separations
> both show the same as the cyan, though the magenta separation of
> the RGB image is lighter than the cyan separation, and the yellow
> is much lighter than all of them. The stroke around the total
> black appears to remain the same intensity.
> As to the spot color, it is only present in the stroke around the
> Rich Black box. It is not visible in any of the separations,
> even if I turn on convert spot colors to process colors.
I get the same results. Looks like a Ghostscript problem to me. :-(
Hm, maybe I'll check the latest ghostscrip version.
The overall summary of my experiments: There seems to be no way to
get a CMYK image from a CMYK PDF on Linux, since the only way is through
Ghostscript which doesn't preserve CMYK colors 1:1.
"What we nourish flourishes." - "Was wir nähren erblüht."
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