#249 luminosity/saturation panel problem with uniform blue
There seems to be a problem with some color profiles (and, specifically, with the ones I made for my 7D): when I change even slightly any of the options in the luminosity and saturation panel (saturation, contrast, curve), the parts of the image that have a uniform blue color get screwed up. As an example you can check the following image of a target (the problem shows up also in other images, the target is just a good example): in the upper part you can find the image, developed by ufraw, with contrast and saturation 1.0; in the bottom part you can see the same image with contrast set to 1.1. You can notice the problem I mentioned in patch L19.
http://albertoferrante.name/ufraw/blueproblem.jpg
I am using a single shaper profile, VNG interpolation an color smoothing. I tried to change profile and interpolation parameters without success.
The problem not only shows with 7D, but also with other cameras; other Canon users reported similar problems, also by using color matrix instead of an ICC profile.
Some follow-up comments to this bug report are in this forum thread: http://sourceforge.net/projects/ufraw/forums/forum/434060/topic/4607893
Regards,
Niels Kristian
Your problem looks a lot like the blue channel noise/missing information problems described in this article written by Elle Stone: http://ninedegreesbelow.com/photography/negative-primaries.html
Regards,
Niels Kristian
Please check if this is still a problem with the current UFRaw cvs code compiled against lcms2.
Regards,
Niels Kristian