I've been asked to process of batch of scans. One of the things on the checklist is to "set the gray point". I'm wondering if I'm doing it correctly. What I do is open the Info panel, call up the "Curves" panel, select the middle eyedropper, then check the control strip in the image to find a middle-value gray that is exactly balanced, i.e. the R, G & B numbers are identical. Then I click that spot. (FYI, my eyedropper is set to a 5x5 sample). Is this the correct technique? What do I do with the images where I can't find a spot that is exactly balanced? This screen shot shows an example: there is no spot on the control strip that shows up as perfectly balanced in the Info panel.