Re: Argyll CMS and tiffgamut
Re: Argyll CMS and tiffgamut
- Subject: Re: Argyll CMS and tiffgamut
- From: "dpascale" <email@hidden>
- Date: Thu, 21 Feb 2008 14:36:08 -0500
Hello Markus,
When using tiffgamut, I place all my files (Argyll .exe, copies of ICC
profiles and TIF images) in the same folder, near the root (C:\Temp).
I get the same error messages you mention.
It does not compute the gamut volume as a single number, but gives a gamut
extent in the form of L*a*b* coordinates which enclose a volume (look for a
.gam file). It can also generate a VRML 3D image (.wrl) of the same data.
The way I understand tiffgamut is that it wraps an icc profile around the
image gamut, with the maximum gamut being the profile itself. As a
consequence, all other image data, out of the profile gamut, is clipped.
I made the following test:
I saved two TIF files containing the same RGB coordinates, but one file
assigned with the sRGB profile and the other with ProPhoto.
Since the ProPhoto file describes a larger gamut than the sRGB one, I
expected a larger enclosed gamut. However, the gamut files are exactly the
same. I used Relative Colorimetric (-ir flag) or Abs-Col (-ia) without
significant differences. I asked the question to the utility author and am
waiting for a response.
Danny Pascale
email@hidden
----- Original Message -----
From: "Nov06" <email@hidden>
To: "ColorSync Mailing List" <email@hidden>
Sent: Thursday, February 21, 2008 4:33 AM
Subject: Argyll CMS and tiffgamut
Hi,
this might be a stupid question but where does tiffgamut place the gamut
and VRML files. I was running it with:
tiffgamut -v -w <path to AdobeRGB1998.icc> image.tif
It calculates the volume of the gamut but I cannot find the gamut file.
It gives two warnings:
TIFFReadDirectory: Warning, image.tif: wrong data type 1 for "XMLPacket";
tag ignored.
TIFFReadDirectory: Warning, image.tif: unknown field with tag 34665
(0x8769) encountered.
I've dumped all the binaries in /usr/local/bin, btw.
Thanks,
Markus
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