Re: The Mysteries of Preview
Re: The Mysteries of Preview
- Subject: Re: The Mysteries of Preview
- From: Andrew Rodney <email@hidden>
- Date: Sun, 20 Jun 2004 17:45:23 -0600
on 6/20/04 4:40 PM, Matt Deatherage wrote:
>
Preview opens an untagged image and does nothing to it, so you see
>
uncalibrated, unmatched raw pixel values on screen.
On my end, Chris end and Ian's end, depending how you open the file (let's
not even go there), the display profile is used for preview. That is, the
application takes your display profile and uses that as the assumption for
the numbers.
>
You believe, however, that Preview is assigning the Generic RGB source profile
>
to the untagged image, and using your display profile as the destination
>
profile, and performing matching.
The boys at Apple are saying this, I'm not seeing it. It's using my display
profile at least on two different Mac's running 10.3.4.
>
Therefore, to replicate this behavior, you tag the image with the Generic RGB
>
profile (an embedded source profile) and open it in Photoshop. Photoshop uses
>
your display profile as a destination for all images, so you see the matching
>
described just above. It looks different because that's not what Preview is
>
doing.
1. Open image in Photoshop and insure it's in sRGB. Save a copy to disk
without an embedded profile.
2. Open that image in Preview.
3. Make sure both preview windows are side by side at the same zoom ratio.
4. Go into Photoshop and use the Assign Profile command and pick "Generic
RGB" (you'll have to copy it into the user profile location since Photoshop
doesn't see it where Apple places it.. Let's not even go there, that alone
is goofy enough).
5. View the two windows. Do they match? Not for me. Now Assign your display
profile to the image in Photoshop. Do the two images now match? Yes on my
end.
Conclusion is that Preview is using the display profile as the assumption,
not the Generic RGB profile. Despite what Apple tells us in two totally
different stories (one being the ColorSync preferences, the other being that
John is telling us).
Andrew Rodney
http://digitaldog.net/
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