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If the peaks/curves of the R, G, and B histograms are at different points, it just means that the image is not pure grey, it must have a slight colour cast to it. I imagine you could convert to a greyscale image, or just look at the histogram without the separate channels?
To post the histogram, make sure the histogram window is on top and hit alt-printscreen button to copy it to clipboard, then open new photoshop image and hit ctrl-v to paste it.
My "lightbox" in the mail is one of those elec2go.com.au A4 sheets.
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