[argyllcms] AW: Re: AW: Re: Question about the principle use of Argyll
- From: Hermann-Josef Röser <posts@xxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Tue, 27 Mar 2018 10:40:51 +0200
Hello,
may I come back to this thread with another question?
If your destination is the normal AdobeRGB profile though, you are limited
to Colorimetric intents because it is a matrix profile.
Is this due to the fact that the required operations for the other intents
cannot mathematically be realized with matrices? If so, would it be possible
to create an equivalent LUT-profile for AdobeRGB which would allow these
operations?
In the contribution "Colour management and transformation through ICC
profiles" in the book "Colour Engineering" Dawn Wallner writes on page 258
that "it is not uncommon to find all the AtoB#Tags in the tag table pointing
to the same data in the profile." This is what I see in the profiles created
with SilverFast for my scanner. However, the GUI nevertheless allows me to
choose among all the rendering intents (also with AdobeRGB as the
destination profile). However, if I compare the rendered images on a pixel
by pixel basis, they are all identical whatever intent I select. I just
wonder, if this is so because the destination profile is a matrix profile?
If this is correct, I would have thought that only the colorimetric intents
should be available in the GUI and the others not.
Best wishes
Hermann-Josef Röser
--- Begin Message ---
- From: "Graeme Gill" <graeme@xxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Wed, 22 Nov 2017 13:17:55 +0200
Hermann-Josef Röser wrote:
Hi,
That is exactly what I did up to now and using the scanner software to
render the scans to AdobeRGB. But then I am bound to the rendering intent
the profile is in, which according to your documentation is always
colorimetric. The intent specified in colprof with the -Z parameter is,
according to your documentation, not really used by Argyll.
that's purely a function of the CMM or Application you are using. For
instance,
if you use cctiff, then you can chose whatever combination of rendering
intent
you like from those present in the source and destination profiles. If your
destination is the normal AdobeRGB profile though, you are limited to
Colorimetric
intents because it is a matrix profile, but if you were to create a device
link using collink, then you have a wide variety of intents available.
Cheers,
Graeme Gill.
--- End Message ---
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