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

  • From: Darzur <zurdar@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 08 Nov 2010 17:58:33 +0100

On Mon, 08 Nov 2010 07:41:00 +1100, Graeme Gill
<graeme@xxxxxxxxxxxxx> wrote:

>As explained in the link I posted before, Argyll reports an approximate
>gamma that is the equivalent zero based (ie. no offset) power curve that
>has the same value at 50% as the real curve. A visual scale based on
>black and white stripes will (probably) be a power curve offset
>at zero, because it is composed of a real black that is non-zero.
>Naturally, these two different ways of interpreting gamma are
>not the same.

Hello Graeme,

I still have no idea how to calibrate monitor properly. Please look


it's clearly visible that actual output from my monitor (at 50% input)
is a little bit darker than actual target. It should be corrected at
LUT level by slight brightening at 50% input what perfectly
corresponds to my visual observations. Unfortunately after calibration
I have curves like this:


so my question is - why is it happen and how to avoid it?
best regards,

Other related posts: