Re: preview/photoshop
Re: preview/photoshop
- Subject: Re: preview/photoshop
- From: Ross Peterson <email@hidden>
- Date: Fri, 14 Jan 2005 11:58:19 -0600
John,
I've opened images with an embedded profile side by side in Preview and
Photoshop and found them to look pretty similar, so I'm guessing
there's something you're doing that I wasn't.
I can do the same ... most of the time... but the match goes south just
as Doreen has described more often than is convenient, and the idea of
having to trash and reset preferences every time it does happen is at
the very least inconvenient.
First off and most obviously Photoshop has a working space, Preview
doesn't, and what you do when opening images in Photoshop makes a huge
difference in what the images look like. What's you're working space?
That depends on what I'm working on, but generally Pro PhotoRGB. I know
how to open images correctly in PS.
What happens when you choose a different working space?
Nothing
When opening
images in Photoshop are you converting from the embedded profile to the
working space?(probably yes, but worth asking)
No. I always leave files in their original space (if it's a proper
editing space) unless they have to be converted from input like a
scanner or camera profile. Obviously converting to proper output space
if necessary.
Are you sure there's
really a profile in the image and not just the sRGB EXIF tag we talked
about in this list a few days ago?
Positive. I put it there myself and have verified it from an Apple
perspective with Get Info in Preview. I understand the difference
between a tag and an embedded profile.
Chris pointed out black point compensation makes a difference. It
sounds like you're seeing a significant difference, and when that
happens it often means a difference in gamma.
Yes, I believe it is a difference in gamma correction applied because
as I noted in my previous post, the disparity disappears when I select
a display profile that has a 1.8 gamma correction. But my question then
becomes why do the Apple Apps suddenly, out of the blue, start
displaying images incorrectly using my normal, 2.2 gamma corrected
display profile? And why does trashing the "hidden" ColorSync
Preference file fix it?
If your image does not
have a profile then it's most likely going to look different in
Photoshop than Preview unless you have Photoshop's working space set to
the profile of your default display.
Yes, of course. But I would NEVER set my display profile as a working
space.
Adobe ignores which display is
default and just picks the one with the menu bar, gets the profile for
that, and matches images from your working space to that display
profile.
My default display is my 20" Cinema, the menu bar is on it, and I use
Monaco Optix XR Pro to build my display profiles. You seem to be
missing the fact that this works FINE on my system "most" of the time.
My PS and Safari/Preview are nearly identical. What little difference I
see I will write off to CMM differences. BUT, when the images do not
match between PS and Safari, which happens out of the blue and more
often that I would like, no amount of messing with System Preferences,
display profiles, PS preferences, etc. will return things to normal.
The only solution I have found is Jason Sewell's fix via the terminal.
If you want to set up Photoshop so it's behaving as similarly to
Preview as possible you'll have to set your working space to the
profile of your display with the menu bar, and when you open images
select either the option "Use the embedded profile instead of the
working space" or "Convert the document's colors to the working space".
I would NEVER set my PS working space to a monitor profile. That would
be a particularly BAD practice from a color management perspective.
Photoshop has a much more elaborate workflow setup, more options, lots
of things you can change as you like, so in many cases I wouldn't
expect an image when it's first opened in Photoshop to look the same
when opened in Preview, because of the working space conversion in
Photoshop.
I am extremely confident that I know how to open an Image in PS so it
is displayed correctly.
Now what I would expect though, is that once you've opened
an image in Photoshop into whatever working space you want, edited
however you like then saved that image with the working space profile
embedded, I would expect that to look the same in Photoshop as it does
in Preview, assuming your default display is the one with the menu bar.
So would I. And that is exactly what is NOT happening when this
"condition" occurs. I realize you are at a disadvantage not knowing my
skill/knowledge level with PS and not being able to see this phenomenon
happen for yourself, but I am positive that it occurs and am also sure
that I can make it go away by trashing that file that Jason Sewell
references in his instructions. If there is a way that I can copy that
file when this happens again I would be happy to forward it to you to
see if you guys can make anything of it. Or if there is a log file or
something that may provide a clue?
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