Thanks, Robert, Sorry for the confusion. I am a beginner of 3D graphics.
Right now, there is a nice JPS viewer based on OSGviewer. I want to add function to adjust the brightness and contrast of the image when viewing it, just similar to what one can do to a JPEG image with a JPEG viewer. Previous I thought OSGviewer has this kind of function for osg image already, so that one may call the function or take it as a reference. Hope this is clear. with best wishes Zhenlong
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