Re: On ProPhotoRGB
Re: On ProPhotoRGB
- Subject: Re: On ProPhotoRGB
- From: Graeme Gill <email@hidden>
- Date: Thu, 02 Mar 2006 00:15:28 +1100
Roger Breton wrote:
With argyll, one can create a device link that converts from, say, ProPhoto
to sRGB? Turn on gamut mapping on the command line and you're done?
Yes, gamut mapping mode only uses the absolute colorimetric transforms
of the profiles, so the lack of B2A LUTs is not an issue. Matrix
profiles are fast too.
Sounds too easy, Graeme. No blobbing? No ICC v4 perceptual gamut mapping
involved? And it's free?
That's the advantage of the "smart CMM" approach.
So, Graeme, if argyll can create device links that do preserve the tonal
relationship when converting from a larger RGB space to a smaller RGB space,
then it'll be just a matter of applying the device link in our upcoming
release of Photoshop and we'll all be done?
Well of course you're limited to how good the gamut mapping is, and
the device links are LUT based, so you loose some of the nice properties
of matrix/shaper profiles (the high precision, the lack of table artefacts).
Much like the trade-off between general purpose LUT based profiles, and model
base matrix profiles, it is probably possible to contrive model based
gamut mappings that would work smoothly between two matrix based profiles,
but what you gain in smoothness, you would probably loose in not being
general purpose, and in not being easily tailored to be visually pleasing.
Graeme Gill.
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