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Am 04.11.2009 um 18:03 schrieb Martin Orpen:
No offense intended!On 4 Nov 2009, at 15:49, Karl Koch wrote:
now we are getting somewhere and this thread becomes interesting again.
You show the amount of ignorance that is common with the common user!
I'm glad you appreciate that.
Your version was ONE way of converting it. When you start from an extremely wide gamut and convert to an extremely small gamut, you need to make clear, what your intention is. "Color correct" is just impossible. So your intention was "max out the contrast while showing at least some kind of color"
You try to convert from one to the other RGB working space – and both are matrix based. In a matrix based profile there is only one way of converting (not quite true, but good enough if we talk Adobe Photoshop): relaive colorimetric.
You can´t expect to convert out-of-gamut colors this way, so that they would show detail after conversion.
When building an ICC-DeviceLink profile, you can specify different renderings, e.g. image based in the case of Argyll. This seems to be the case in your idiot example. If I do a "normal" perceptual compression, this is the result:
http://files.me.com/basicc/aec8yi Yes, it is easy – if you know what you are doing!
Excellent, I thought my version was good -- if I asked the client to ignore the dark green background...
Yours has a nice blue background and green type
It´s about as close as "your" background R0 G49 B45 sRGB (converted from R0 G0 B255 ProPhotoRGB). RGB values without saying which RGB (profile) mean NOTHING at all, which can be seen clearly in these examples.
Whose "perception" was used to turn R66 G0 B255 to R0 G81 B106?
If they did, show them your test image!
I'm beginning to think that this simple conversion is not as easy as the colour management consultants led me to believe.
You have my permission to use this test image in your future product releases.
Thanks, we´ll use it for selected customers only ;-)
Best regards,
Karl _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/colorsync-users/email@hidden
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