Re: v4 profiles and PRMG
Re: v4 profiles and PRMG
- Subject: Re: v4 profiles and PRMG
- From: Graeme Gill <email@hidden>
- Date: Wed, 06 Jun 2007 00:36:42 +1000
Roger Breton wrote:
According to my information, PRMG is proposed as a "replacement PCS" that's
optimized for a certain incoming gamut. They say it's been adjusted,
visually (don't know exactly how they did it -- mostly HP), to best
represent sRGB colors, for example. So, during an ICC conversion, an sRGB
image would not be converted to plain D50-PCS but to this PRMG, a special
case of PCS optimized to handle sRGB conversions. It has to to do with
tweaking the interpretation of the PCS to best handle the incoming gamut,
which, to my understanding is very different than making no assumptions
about incoming colorimetry.
It's not a PCS, it's a gamut. It's designed around typical printing colors.
The idea of the V4 sRGB profile is that it will gamut map between sRGB and
the PRMG.
Apparently, the sRGB PRMG work is done. It's a matter of profilers to
release it for their own software? And once this is done, then, work on
AdobeRGB PRMG will start. I don't know how many PRMG they intend to do like
that.
My information is that there have been some tweaks to the PRMG recently
to adjust the locations of the primary cusps on the gamut surface,
so I'm not sure how close to done the HP V4 sRGB profile actually is.
Jack Holmes from HP and his ICC group.
Yes.
[Of course Argyll will happily create V2 profiles that do gamut mapping
between specific source and destination gamuts, including the PRMG.]
Graeme Gill.
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