So what does Preview.app *really* do when softproofing?
So what does Preview.app *really* do when softproofing?
- Subject: So what does Preview.app *really* do when softproofing?
- From: Uli Zappe <email@hidden>
- Date: Sat, 19 Apr 2008 20:10:18 +0200
Hi everybody,
does anyone happen to know what *exactly* Preview.app does when it
offers a softproof (the tiny "Softproof" checkbox in the lower left of
the window that gets opened when you click "Open in Preview" in the
Print panel)?
Usually, a softproof is done by matching the document to the printer
profile and then back to the display profile. That's exactly what's
also described in the AppleScript "Proof CMYK on display" included
with Mac OS X.
However, when I apply this AppleScript to a test image, the result
comes close tho the view that Preview offers (dE(76) max < 1 for a
test target with 32 swatches), but is not 100% identical (as measured
with DigitalColor Meter on the screen).
I've tried various other ways of emulating this softproofing process
(using the command line utility sips, writing my own C program with
ColorSync Manager functions, even calculating the matches by hand with
ColorSync Utility's Calculator), and again, while every approach comes
very close to Preview, not a single one matches its results exactly.
So what precisely are the steps that Preview performs to offer a
softproof? Any ideas anyone?
Thanks a lot in advance for any insight!
Bye
Uli
________________________________________________________
Uli Zappe, Solmsstraße 5, D-65189 Wiesbaden, Germany
http://www.ritual.org
Fon: +49-700-ULIZAPPE
Fax: +49-700-ZAPPEFAX
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