Re: BPC + Perceptual + ISO Newspaper v4
Re: BPC + Perceptual + ISO Newspaper v4
- Subject: Re: BPC + Perceptual + ISO Newspaper v4
- From: Todd Shirley <email@hidden>
- Date: Mon, 1 Dec 2008 12:07:57 -0500
On Nov 30, 2008, at 4:28 PM, Roger Breton wrote:
What you're reporting is most shocking to me and repeatable.
Granted, what Adobe does with Photoshop is Adobe's business but I
never
thought they could process an image through the Perceptual tag in a
way that
I don't understand. Unless there are provisions for this in the ICC
specs I
missed, or maybe this is one of the pernicious effects of applying
BPC in
XYZ, what you described is 100% true -- and sad.
Roger
Conversions through photoshop have behaved this way with every
newspaper profile I've ever used, including SNAP-2007 and several
custom ones I've made with Monaco. It's as if the perceptual rendering
intent applies BPC twice if it is checked on. Oddly, it only seems to
do this with newspaper profiles, while "regular" 300 ink limit
profiles show no difference between BPC on or off using the perceptual
intent. I just made a quick test profile using the GRACoL2006 dataset
and setting the ink limit to 240 and there were slight differences
between BPC on and off, but TIL reached 240 on both, so that is a
little mysterious.
Does anyone know why some profiles give different results with BPC
checked on or off in the perceptual intent, but others do not?
-Todd Shirley
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