Re: CMYK/RGB printing confusion - please help!
Re: CMYK/RGB printing confusion - please help!
- Subject: Re: CMYK/RGB printing confusion - please help!
- From: Robert Clair <email@hidden>
- Date: Wed, 2 Mar 2005 12:38:34 -0500
Or do I get this wrong and the PDFs Mac OS X creates for printing do
not contain an ICC profile?
The print spool pdf's produced by the default Cocoa printing system
(think TextEdit) have profiles - either Generic RGB or Generic Gray.
(This was verified by extracting the profiles from the files by hand
with a text editor and uncompressing them.)
As you can see, I'm utterly confused, and I can't find any
documentation anywhere that's relevant for this problem.
You're not the only one. I'm a developer and the only ColorSync
documentation I can find is of the "grand scheme - block diagram"
variety. This is fairly useless - I understand how it works in
principle. Documentation that explains how any of this is actually
carried out is maddeningly non-existent. As an example, Cocoa allows
you to ask for a calibrated color:
+colorWithCalibratedRed:green:blue:alpha:
The documentation waxes eloquent on the virtues of "device independent"
color.
But then the question seems to arise - calibrated how ? What color
space is this in ???? The lower level quartz API allows you to set the
color space. There is no Cocoa equivalent. Ok. So it has to be in
*some* default color space. After several months of haranguing people
on three different mailing lists the answer from someone at Apple was
"it's not really hooked up yet - wait for Tiger or use the QUartz
interfaces". The person never replied to the follow-up question: Does
"not hooked up" mean Generic RGB or nothing at all ?
Bob Clair
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