Re: Photoshop CS4 DeviceLink CMM Engine
Re: Photoshop CS4 DeviceLink CMM Engine
- Subject: Re: Photoshop CS4 DeviceLink CMM Engine
- From: Marc Levine <email@hidden>
- Date: Mon, 27 Apr 2009 16:43:41 -0400
I think the right answer to this question is:
Should it matter? An ICC link transform is a "bundled transform". In
other words, the transform contains all of the color pieces (input
space, output space, rendering) required to make a digital color
transformation from one color space to another. The engine that
applies the link should be insignificant because all of the numbers
were crunched when the link was made, not when the link is applied (as
opposed to standard input/output transforms, where the CMM needs to do
some heavy lifting "on the fly").
I suspect that, if there was a big difference in CMMs (which...I'm not
sure there is these days), then you might see it in the link-building
process. This is trick-answer as well because I'm not sure which (if
any) link profile-building softwares give you a choice in which CMM
you can use to build a link. Chances are, the CMM that a software uses
is pre-selected by the software manufacturer and then hard-coded.
Last comment is: hopefully, none of this matters because.... one of
the 2 main benefits of a link is that YOU DON'T NEED TO THINK about
all the parameters of a transform (including "Which CMM?" and "Which
rendering intent?"). It's all baked in. This ensures that you get
consistent color transformation by whatever means the link is applied.
The other benefit, or couRse, are the extra goodies you get by knowing
the input and output space when you build the transform (e.g. special
handling of pure colors, secondary colors, entire channels, ink
savings, black-point compensation, etc...)
Hope this helps,
Marc
--
Marc Levine
email@hidden
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