[argyllcms] Re: Gamma wrong for calibration curves?

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 01 Dec 2006 11:30:40 +1100

william.wood@xxxxxxx wrote:

On my system, a ThinkPad T42p with Flexview 1600x1200 LCD display, the
DISPCAL program tends to produce calibration curves at about 2.0 gamma
instead of 2.2 gamma (the default).  Then when the profile is applied to an
image the gamma seems to be corrected by the profile back to about 2.25 or
so.  Is this the intended behavior, am I doing something wrong, or is there
some other explanation?  Thanks,

There is some fun and games with how the black point is handled
(do you subtract the black point from everything, or ignore it
and aim zero at absolute black ?), but no, it's not meant to
be like that.

How are you determining that the gamma of the display after
calibration is 2.0 ?

Graeme Gill.

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