Re: Anomaly between Photoshop 7.0.1 and 6.0.1
Re: Anomaly between Photoshop 7.0.1 and 6.0.1
- Subject: Re: Anomaly between Photoshop 7.0.1 and 6.0.1
- From: bruce fraser <email@hidden>
- Date: Thu, 5 Sep 2002 11:28:28 -0700
At 8:10 PM +0200 9/5/02, Paul Schilliger wrote:
>If you open the image in both PS 6.0.1 and 7.0.1 and preserve the
imbedded
custom profile we created for this customer, the Photoshop 7 image is
flat
and lacks shadow contrast. Almost like it was ghosted back.
I too noticed sometimes a gamma change with PS 7.0 and expected 7.0.1 to
have that issue fixed! Meanwhile I am using PS 6.1 for all profiles to
profiles conversions.
But I now recall that this is possibly due to the fact that Adobe
changed their CMM to version 2 in PS7 as Joe Holmes explained it to me
earlier this year (he had to remake his Ektaspace profiles set) :
I discovered the day before yesterday that Adobe changed their CMM
(the ACE), which they now call version 2, in Photoshop 7. The CMM
(ACE) now looks for the RelCol tag in RGB source profiles instead of
looking for the Perceptual tag, as it had previously. I remade the
profiles
and will send them to anyone who had purchased the set from me in the
past. These profiles will work in both versions of Photoshop, as well
as
in Live Picture and should work in all apps (from Joe Holmes)
So there are probably a number of profiles out there that are not
compatible with Photoshop 7.
Paul Schilliger
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Photoshop 7 simply lets you choose the rendering intent, which
Photoshop 6 ignored in one-way input profiles. It will look for
whatever tag you specify. Photoshop 6 always used the default tag,
which was usually labelled perceptual but was often something else.
Bruce
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