GNOME Bugzilla – Bug 605019
Calibrating without hardware
Last modified: 2020-11-12 15:09:10 UTC
I expect that most home users / consumers won't have calibration hardware available but still care about color management. It would be useful to be able to calibrate the display anyway. These pages http://www.computer-darkroom.com/colorsync-display/colorsync_1.htm describe how it's done on OS X. I've used this myself and it seems to work surprisingly well.
Sure, this makes a lot of sense. I've ordered a book (as a Christmas present to myself!) which should show me the maths I need to generate a VCGT table from scratch. Note: we'll also need to generate the reference images (the ones with the black and white bands) ourselves, as all the existing ones had no-redist licences or were under copyright. A custom GTK widget to create these on the fly would give us the most flexibility too, I think. As a favour (as because I don't have OSX) could you please create me some high-quality PNG images of the apple color calibration steps please. I'm interested in about 6 (or more!) versions of http://www.computer-darkroom.com/colorsync-display/disp-4.gif, with the left up-down slider in different positions, and the right left,right,up-down positioner in different positions too (including center). From that, I'll "reverse engineer" how Apple builds the tables, and do something similar for GCM. I know this might take a few minutes, so after Christmas would be fine.
Also, could you create a profile manually in OSX, and attach the ICC file to this bug please. Thanks.
Richard, is it that easy to reverse engineer just from screenshots? Do you have time for this nowadays? Otherwise, maybe we could consider this as GSoC material...
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