[argyllcms] Re: Wrong gamma reading with Spyder 3.

  • From: Darzur <zurdar@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sun, 07 Nov 2010 21:11:03 +0100

On Mon, 08 Nov 2010 03:11:03 +1100, Graeme Gill
<graeme@xxxxxxxxxxxxx> wrote:

>It wouldn't be expected that a ccmx would make any difference in
>measuring gamma. ccmx affects color calibration, not lightness
>linearity.

Yes, I've checked it and with and without ccmx measurements are the
same. Of course I've started to suspect that my Spyder gives wrong
brightness readings but checked it with 25%, 50%, 75% and 100%
black/white patterns and it's perfectly accurate. dispcal -r (or -R)
still reads D2.06 while in fact it's very close to G2.2 (visually
mathing 50% pattern to 186 RGB grey). I have to experiment some more
and I hope I'll figure it out finally. :)
-- 
best regards,
darzur


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