[argyllcms] Re: [argyllcms] Re: Perceptual spread in targen for non-linearizeddevices

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Gerhard FЭrnkranz wrote:
For well-linearized devices the risk is certainly lower and I'd not expect so 
much difference. But I'm wondering whether it may be beneficial to take the 
pre-linearization tables into account, so that the points get evenly 
distributed in the pre-linearized device space which serves as input to the 
RSPL, and not in the native device space?
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Yes, whether it may be?
I think (too) it would be better to use OFPS in "per-channel 2D-corrected" 
device "space", than OFPS in native device space. By other words, OFPS must be 
used for already "linearized" device. "Linearization" may be perceptual 
optimized in some degree, thus it's middle case between device space spread and 
perceptual spread.

To Graeme Gill: I may agree with Your experience in sample distribution 
methods. I've check that for linearized CMYK device the OFPS in native space 
gives pleasant dE results - max=5.28, avg=1.09, rms=1.255 (3.96 0.74 0.85 
CIEDE2000) for 1536 samples. The charts was rather dark and I've understood 
that OFPS in native space is essential for accurate black generation choice. 
But I've understood too, that for the next profile improvement the perceptual 
spread and "memory color" samples area is important as well.

Thank You all for discussion this problem! It's interesting for me.

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