Re: CMYK/RGB printing confusion - please help!
Re: CMYK/RGB printing confusion - please help!
- Subject: Re: CMYK/RGB printing confusion - please help!
- From: Greg Titus <email@hidden>
- Date: Wed, 2 Mar 2005 10:02:09 -0800
On Mar 2, 2005, at 9:38 AM, Robert Clair wrote:
+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 ?
It means Cocoa uses the default display profile for both the
"calibrated" calls and the normal calls - right now there is no
difference between the two sets of color creation methods. In both
cases, Cocoa creates the lower level quartz colors in the default
display profile, which means that there are no conversions needed for
display, which means you get the same RGB values on screen as you
specified in your code, thus a no-op.
(This was discovered from laborious debugging with breakpoints on the
Quartz methods to see what Cocoa's NSColor is actually up to. I don't
think it is actually documented specifically anywhere.)
Hope this helps,
- Greg
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