[argyllcms] Re: LUT versus XYZ monitor profile

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 22 Dec 2009 10:54:13 +1100

andrzej duda wrote:
I've got this message after profiling my monitor.

/Applications/Argyll_V1.1.0_RC2/bin/colprof: Warning - *Values clipped in setting A2B LUT!*
*** *Try switching to XYZ PCS* ***
Gamut hull mapping errors: = avg 0.908224, max *4.044350*

I'm not sure. I tried putting in those warnings for the situation
where the display primaries are outside the L*a*b* coding range,
but the warning seems to be triggered in many other situations,
so I'm not sure it is worth leaving them on, given all the
trouble they will create.

so I've made another one using the same .ti3 file and -ax. This time no warning messages and much better
numbers :
profile check complete, *peak err = 0.377113, avg err = 0.024427, RMS = 
0.043701*
compared with the -al version:
profile check complete, *peak err = 2.473854, avg err = 0.363055, RMS = 
0.458722*
*
But the new profile gives more banding in dark grays and rather strange 3D in 'gamt' tag.

Because its encoded in another space, you can expect differences. I'm not
sure about the gamut tag.

Graeme Gill.

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