[argyllcms] dispcal sRGB TRC target does not maintain black brightness

  • From: Vallo Kallaste <kalts@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 24 Dec 2019 12:24:10 +0200

Hi

I noticed that dispcal sRGB TRC target elevates black brightness, it isn't
native anymore althought it says so:
/--/
Target black brightness = native brightness
Target gamma = sRGB curve
/--/

dispcal -g2.2 -k0 maintains native black brightness
dispcal -gs -k0 has elevated black brightness, I get noticeable ~80:1
less contrast.

Looking at the calibration curves the -g2.2 ones go down to R=G=B=1 and
then have straight section down to 0.
In -gs case the curves end up separately on somewhat higher Y values.

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