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Message: <blockquote data-quote="jring" data-source="post: 3377407" data-attributes="member: 133897">Hi,thanks for the interesting experiment, Henry and to everybody else for the discussion. I have had a quick look at the image in post #14 (I could see a difference without problems on my monitor and phone) and took the rgb values for ten random points in each color field. It looks to me that the middle field is indeed not a neutral gray but quite bluish R90G104/B125 on average. Left field was R90G104B117 and right field was R93G107B119.I'm not sure if it would be overly simplistic to use the middle image to calculate a correction factor to a neutral gray with R105G105B105 for each color channel and apply this to the left and right images. When doing this I get R105G105B98 for the left image and R109G108B100 for the right image, for whatever it's worth...Joachim</blockquote>