Re: 8 bit vs 16 bit profiling -- does anyone gives a hoot?
Re: 8 bit vs 16 bit profiling -- does anyone gives a hoot?
- Subject: Re: 8 bit vs 16 bit profiling -- does anyone gives a hoot?
- From: Graeme Gill <email@hidden>
- Date: Thu, 07 Jul 2005 12:36:49 +1000
- Organization: Argyll CMS
Roger Breton wrote:
Does anyone know how Photoshop CS2 deals with 16 bit output profiles? Given
an 8 bit Source CMYK profile and a 16 bit Destination CMYK profile, what are
the prospects for becoming a victim of color shifts introduced by rounding
off color conversions?
Sounds unlikely. I understand that Photoshops color conversion routines
were implemented with a careful eye towards precision. Also don't
assume that because the ICC profile is 8 bit, that the transformation
created from the profile somehow is going to be 8 bit. Some CMMs
may be implemented that way, but there is no compunction to do so.
In icclib for instance, the ICC profile is regarded as a storage
format, and all the encoded parameters are converted to floating point
for the use of the actual color transformation routines.
Graeme Gill.
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