[argyllcms] Re: gamut conversion through the LUT ?!

  • From: lee scratchy <leescratchy@xxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 22 Jul 2008 09:41:44 +0000

OK thanks all, now I understand that this can't be done with 1D LUT's.

but there's this PDF that talks about ICC corrections in the movie industry :
http://www.color.org/ICC_Chiba_07-06-19_PM_DMP_Float.pdf

so they explain that they use a lot of proprietary 3D LUT's(some are even 
encrypted), but on page 16 they say :

"Use the ICC Curve-and-Matrix model:

Film density -> Three 1-D LUTs -> 3x3 Matrix -> Scene XYZ

This Curve-and-Matrix model can be inverted exactly for converting Scene XYZ to 
Film density

NOTE: 3D LUTs cannot be inverted exactly"

so they made a mistake I guess ?!

-Maxime
________________________________

From: hvengel@xxxxxxxxxxx
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: gamut conversion through the LUT ?!
Date: Mon, 21 Jul 2008 17:13:39 -0700

Just to be clear if you have a correct profile for the source image(s) and a 
correct profile for the display device then you can use a color management 
engine to create a transform from the source color space to the display color 
and you will get the correct results when that transform is allplied to the 
images. But this assumes that you have a good display profile (like one created 
with ArgyllCMS using a measurement device) and that you have some how gotten a 
good profile for the source images (this could be problematic unless you have 
control over the whole video capture chain).
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