[argyllcms] Re: ArgyllCMS: shadow details and blue color issues. What I'm doing incorrectly?

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 11 Oct 2012 10:02:26 +1100

Graeme Gill wrote:
> Note though that it depends to some degree what you are looking for.
> The nature of a print device is that there is a severe trade-off between
> saturation and lightness in blue. The Perceptual intent (by the tuning I've 
> chosen)
> is lighter and less saturated than the clipping of the colorimetric intent,
> and (to my taste) is visually closer to the very intense and light
> color of the source AdobeRGB blue (Helmholtz-Kohlraush effect). The 
> colorimetric
> reproduction is certainly more saturated, but is overly dark in my opinion.

Note another difference between these intents: The perceptual intent
is gamut mapped for Adobe1998. This means that it is allowing space
for a pure Adobe1998 blue to be mapped within the gamut of
the output device. I suspect that the profile you are comparing
it with is not actually doing source to destination gamut
mapping for its perceptual intent, and therefore is not compressing
the saturation of the blue sufficiently to accommodate a pure blue input,
and hence for less saturated input values, is producing
a more saturated output.

Graeme Gill.


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