In contrast though, most "hard proofing" is expected to withstand
a simultaneous viewing with what it's meant to be emulating. That's
the ultimate proof of the pudding. Now any softproofing that
doesn't have the option of reproducing an absolute matching white
point
to what it's emulating, can't be used in that manner, and
completely fails the "proof of the pudding" test.
You're making it sound like there is no difference between RelCol and
AbsCol in both an ICC v4 soft proofing context, as well as a
Photoshop context. There is white simulation. It's just predicated on
the end user being adapted to display white, and that happens to work
whereas when it's predicated on the end user not being adapted to
display white it doesn't work.
Photoshop (from your explanation) and ICCV4 only seems to
support the former. Some people would like to be able
to do the latter. ICCV V2 used to provide a first order
means of providing the latter, even if it isn't perfect.
Actually it didn't provide it because there was no specificity as to
the level of adaptation of the end user. No matter what, something
had to be assumed because it wasn't specified. And what most
implementations did was assume the end user was not fully adapted to
display white, and those implementations yielded inferior results.
ICC v4 prescribes the same result as an ICC v2 display profile has
in Photoshop since version 6. If you're saying ICC v4 soft
proofing is broken you are in effect saying it's been broken in
Photoshop for a long time.
If you say so (I'm not in a position to verify this). From some
reports
latter versions of Photoshop have an "Emulate Paper White" flag
somewhere.
How does this affect its behaviour ?
When you check "Simulate Paper White" it is using Absolute
Colorimetric rendering to the display. The on-screen result is the
same for a v2 display profile, or a v4 display profile. And if you do
the conversion using an ICC v4 display profile, and AbsCol using the
Apple CMM with an AppleScript you get the same result as well.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management, 2nd Ed"
Published by PeachPit Press (ISBN 0-321-26722-2)
