[argyllcms] Re: help with camera profile

  • From: Stephen T <stwebvanuatu@xxxxxxxxxxxx>
  • To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
  • Date: Sat, 28 Jul 2012 18:08:26 -0700 (PDT)


If -am is not satisfactory, there might be something wrong with the input photo 
and/or your workflow. Someone already noted this back at the start of the 

Visual evaluations are not satisfactory because there are dozens of variables 
that affect whether or not the photo looks "good". You can review many photos, 
some will be good and some will look wrong. I've wasted hours doing this.

Delta E is a more reliable test of accuracy, see profcheck. Use a different 
photo(and perhaps a different target, e.g. ColorChecker has better spectral 
properties) to the one used for profiling. Evaluate delta E with your profile 
in various kinds of lighting.


 From: Iliah Borg <ib@xxxxxxxxxxx>
To: argyllcms@xxxxxxxxxxxxx 
Sent: Sunday, 29 July 2012 12:05 AM
Subject: [argyllcms] Re: help with camera profile
> I used -aS

I see - but that implies you are fighting non-linearity somewhere, probably in 
the raw converter itself; or your exposures are on the hot side, and you suffer 
sensor highlight non-linearity?

Iliah Borg

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