[argyllcms] Re: Scaled Rec709 TRC question

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 14 Feb 2011 14:28:46 +1100

János, Tóth F. wrote:
This produces an exact Inverse Rec709 Encode curve on the display. But it's
still looks bad.

Generally using the inverse of the encoding curve looks bad, because
the viewing conditions are different. Typically the encoding assumes a
very bright studio viewing situation, while the actual display
viewing conditions are dim to dark. The discrepancy between
the viewing gamma encoding and a typical display gamma characteristic
traditionally makes this viewing conditions adjustment (see
"Digital Video and HDTV" by Charles Poynton for more explanation
of this.)

So, the question remains: What parameters should I use for the Dim and Dark
presets to match with the scaling of ArgyllCMS/dispcal?

Since you haven't explained exactly what you want to match, it dificult
to say. dispcal has a range of ways of dealing with the non perfect black
of the device, and this can have a noticable subjective effect.

Graeme Gill.

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