[argyllcms] Re: Calibration issues using argyll

Graeme Gill wrote:

What do you mean by "better" ? Better looking, or closer to the target ?
If the latter, have you measured it ?
After I created a profile, I normaly check out the results by browsing to two different locations on the web. The first one [1] renders a test image in which numbers are displayed with different neutral RGB values. Profiles generated with iColor produce results where all numbers are visible and none of them seems to have any color cast to the naked eye. Profiles created with Argyll also reveal every number, but there is a slight greenish or reddish hue on numbers on the dark area from 4 downwards. The second image I open is to see how many visible bands in a supposedly smooth gradient appear. Here, both programs produce profiles that show banding, I just use it to compare how the luminance is distributed through the range when comparing profiles created with the same calibration target. 
The programs I use for these "tests" support color management, of course.

[1] http://img1.abload.de/img/einser341.jpg
[2] http://cdn.img.fotocommunity.com/photos/3701461.jpg


OK, try out <http://www.argyllcms.com/dispcal_win.zip>, and set the (new)
-A parameter to some value between 8.0 (the default) and 1.0. e.g. try
4 to start, or even 2, and see if it changes the coloration near black.
Note that a value of 1 will create a linear blend between the white point
hue and the black point hue.

Graeme Gill.


Will do that right away, thanks,
Steffen

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