[argyllcms] Re: Colorport CGATS to Argyll CTI3 conversion utility

> --- Ursprüngliche Nachricht ---
> Von: Graeme Gill <graeme@xxxxxxxxxxxxx>
>
> Not at this time. Argyll isn't currently oriented towards manual
> color adjustment, most of the effort has gone into producing
> the "right" result based on the measured numbers. One method that
> has been used to manipulate the contrast to some degree is to override
> the viewing conditions parameters, particularly the adaptation luminance
> levels. e.g. using something like -d0 -da:1000 (substitute various
> luminance levels between (say) 1 and 5000 cd/m^2. La should be the
> ambient illuminance in Lux divided by 15.7). The source could
> also be manipulated with the opposite effect e.g. -c0 -ca:1000 etc.
> You should really check first if you are choosing appropriate
> viewing conditions for your situation, before artificially manipulating
> it this way.

Graeme,

I've noticed, that V0.53 seems to choose a too light "black" for perceptual
intent (noticeably lighter than the darkest reproducible neutral L*, at the
relcol. [a*,b*]==[0,0] locus), which also results eventuelly in a "washed
out" or low-contrast appearance. This seems not to happen in previous
versions - their perceptual intent renders black darker. I haven't yet
attempted to analyze the root cause. Might it be related to the skewed
perceptual gray axis issue, I had discussed with you? Did you probably
already include some changes regarding this issue in 0.53, which might lead
to the behaviour we see now?

Regards,
Gerhard

-- 
Gerhard Fuernkranz
nospam456@xxxxxx

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