[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

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,

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