[argyllcms] Re: colprof and AtoB1/BtoA1 or relative colourimetric intent
- From: "Guy K. Kloss" <g.kloss@xxxxxxxxxxxx>
- To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
- Date: Fri, 20 Nov 2009 15:58:01 +1300
On Thu, 19 Nov 2009 22:11:58 Kai-Uwe Behrmann wrote:
> So dont worry the profile is relative colorimetric despite the perceptual
> naming. This still complies with the spec and as pointed out with common
> pactise.
OK, that is useful information. This way I don't have to worry about it, that
using the A2B0/B2A0 will introduce gamut mapping when I specify a relative
colourimetric intent in absence of the A2B1/B2A1 tables.
> Regarding your options, I would omit the -u switch:
> " -u If Lut input profile, make it absolute (non-standard)"
> With D49 as white point it is not a huge difference, but is wrong for most
> cases.
Hmmm, re-reading the description of the tags again it was probably not the
most wise choice. I was intrigued by the fact that it would not clip colours
exceeding the whiteness of the test chart, which can happen quite likely in
situations with inhomogeneous illumination.
Guy
--
Guy K. Kloss
Institute of Information and Mathematical Sciences
Te Kura Pūtaiao o Mōhiohio me Pāngarau
Massey University, Albany (North Shore City, Auckland)
473 State Highway 17, Gate 1, Mailroom, Quad B Building
voice: +64 9 414-0800 ext. 9585 fax: +64 9 441-8181
G.Kloss@xxxxxxxxxxxx http://www.massey.ac.nz/~gkloss
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