[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 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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