[argyllcms] Re: Absolute minimum number of patches for a matrix/TRC monitor profile
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 05 Feb 2010 13:06:49 +1100
Gerhard Fuernkranz wrote:
Shouldn't four suffice? The three primaries should be enough to
determine the matrix and also the WP, and additionally e.g. a middle
gray for finding the gamma.
As I understand it you need RGB + W to determine the matrix, as
RGB on their own don't set the channel scale factors
(see icc/icc.c icmRGBprim2matrix()).
If it's a pure Gamma curve then perhaps you only need one
gray patch to set that, although adding black gives a more
complete picture of the device, and makes it safer if the
model has an offset component (as the shaper type profile might).
Graeme Gill.
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