Re: scanback profiling question (rendering intents)
Re: scanback profiling question (rendering intents)
- Subject: Re: scanback profiling question (rendering intents)
- From: bruce fraser <email@hidden>
- Date: Fri, 9 May 2003 12:52:24 -0700
At 3:16 PM -0400 5/9/03, Terry Wyse wrote:
on 5/9/03 2:09 PM, Steve Upton wrote:
I have just performed some tests and found that Photoshop does
indeed support
the same intent table on "both sides" when performing conversions. In
retrospect I had reached my conclusions on the behavior of Photoshop 6 with
scnr profiles.
Always eager to reveal my ignorance to the world, I have to confess I'm not
getting the concept of applying a "rendering intent" (gamut
mapping/compression/clipping) on a Device->PCS transform. Why would this be
anything other than a straight colorimetric conversion with the "intent"
(mapping/compression/clipping/whatever) handled only on the PCS->Device side
of the conversion.
More to the point, why would there even BE the need for some sort of
rendering intent required on the Device->PCS given that all colors in the
Device can be accurately mapped to the PCS (Lab) space? What on the device
side could be considered "out of gamut" that a rendering intent needs even
to be considered?
I don't think Thomas implemented it because it was useful, he
implemented it because it was the spec. That said, if you're working
with a huge capture space, it might be useful to do some gamut
compression on one side of the conversion and the rest on the other
side. Kind of a blunt instrument, though.
To FURTHER complicate things, this would imply at least the possibility of
applying one rendering intent on the Device->PCS side and DIFFERENT one on
the PCS->Device side. But where is the mechanism for this? Or said another
way.....
Convert from source to Lab using RI#1, convert from Lab to
destination using RI#2...
Bruce
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