Re: ColorSync and printing -- Panther (1 of 2)
Re: ColorSync and printing -- Panther (1 of 2)
- Subject: Re: ColorSync and printing -- Panther (1 of 2)
- From: John Zimmerer <email@hidden>
- Date: Fri, 19 Dec 2003 20:53:15 -0800
In this particular case, I believe the "No Color Adjustment" means
the color will be matched to Generic RGB Profile.icc then left alone.
This is why choosing this mode seems to result in color similar to
that printed from Mac OS 9 -- the Generic RGB Profile.icc is very
similar to the "raw" RGB color space used in Mac OS 9. So if you
pre-match your data in an application like Photoshop, the data isn't
(currently) left alone after that -- it's actually matched to Generic
RGB Profile.icc and then not touched by the driver.
Wait a minute. Something doesn't make sense here. If I get essentially
the same thing from OS 9 and OS X with Same As Source in Photoshop and
No Color Adjustment in the driver, that tells me that the driver must
be aware of Generic RGB being used. So when No Color Adjustment is
selected, it must tell ColorSync to use Generic RGB as the
destination.
Whether Generic RGB is matched to by the driver's design in this case,
I can't say. Apple has been very clear to the vendors that ColorSync
will always match to something. If the driver declines to provide a
profile proactively (e.g., No Color Adjustment), the end result is
essentially the same as the driver actively providing the Generic RGB
profile. By design, when no profile is provided by the driver,
ColorSync will match to Generic RGB.
Otherwise, if Generic RGB is source (and this much both you and John
Fieber have confirmed is the case), and there was something OTHER THAN
Generic RGB used as the destination - we would NOT be getting the same
output between OS 9 and OS X. If the Factory Profile or the Current
Profile from the ColorSync Utility were being used, then that would
mandate a conversion by ColorSync even in the case of No Color
Adjustment.
I didn't say same, I said similar. Many have assumed that Same as
Source plus No Color Adjustment on Mac OS 9 yields the same results as
on Mac OS X. This is just the first time the assumption has been
declared false. It might *appear* visually to be the same, but that's
only because device RGB on Mac OS 9 is very similar to Generic RGB on
Panther.
We've been working with Adobe and 3rd-party printer vendors on ways
to streamline this. I don't have anything to report yet, but we're
collectively making progress on making sure color is only matched
once when printing, and that driver settings get easier.
In the meantime we could really use a null option somewhere obvious so
we aren't profiling over converted profile targets, and having both
Adobe and Apple sticking their fingers everytime the Print button is
pressed. Please?
We're working on that.
JZ
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