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

  • From: "Xavi" <aruiz@xxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Fri, 12 Oct 2012 01:52:39 +0200

Hello Graeme.

Thank you, once more, for your reply.

Yes. Some days ago I made a profile using the prophoto.icc instead of the
Adobergb.icc and I see some differences but not important. 

Now I am making a profile using the sRGB_IEC61966-2-1.icc, to check if ther
are changes on the intensity of blue color.

Also I have profiled, with your soft, my Canon MP540 and I am letting to dry
the patches printed with a different ink with a very neutral black ink.

Only to test, and to learn, I have made the same profile with the option -q
m, and later with the -q h and -q u option. The results are a surprise for
me. I will show you a comparison with PS CS6 softproof.

I prefer to show you, at the same time, the results of the MP540, the
pro9000MKII with another ink, and the results of creating a profile with
different -q options.

Thank you for your help.

Best Regards,

-----Mensaje original-----
De: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
En nombre de Graeme Gill
Enviado el: jueves, 11 de octubre de 2012 1:02
Para: argyllcms@xxxxxxxxxxxxx
Asunto: [argyllcms] Re: ArgyllCMS: shadow details and blue color issues.
What I'm doing incorrectly?

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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