wgCMYK Broken

The Curvemeister 3 beta test. Please post and discuss bugs, screen shots, suggestions, and any other information about your testing. This board is only visible to Curvemeister 3 beta testers.
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derekfountain
Posts: 251
Joined: Fri Jan 26, 2007 1:24 pm

Postby derekfountain » Sun Oct 21, 2007 7:42 pm

The first screenshot attached shows how my 16bit image looks in RGB mode with a shadow and highlight point set. About right. The second screenshot shows how it looks in wgCMYK mode for the same operation. Probably not right... :)
-default
Posts: 1916
Joined: Thu Mar 26, 2015 1:53 am

Postby -default » Sun Oct 21, 2007 7:50 pm

Thanks, Derek. Totally reproducable, 16 bit only.  Thanks.
derekfountain
Posts: 251
Joined: Fri Jan 26, 2007 1:24 pm

Postby derekfountain » Sun Oct 21, 2007 7:54 pm


Thanks, Derek. Totally reproducable, 16 bit only.  Thanks.


It's probably related, but here's another issue with the same image. I put a sample point in the sky and in RGB, Lab and HSB modes it points to cyan/blue. Switch mode to wgCMYK and it goes black!
-default
Posts: 1916
Joined: Thu Mar 26, 2015 1:53 am

Postby -default » Sun Oct 21, 2007 8:07 pm

I think I know exactly where the problem is.  wgCMYK is unique in that the image values are stored inverted, and this is being ignored for samples in 16 bit mode.  This is a great bug because it will be much easier to fix than it was to find!
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