[argyllcms] Re: Calibration issues using argyll
- From: Steffen <ssachse@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 10 Sep 2008 04:12:08 +0200
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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