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It is possible to see how the Histogram for an image works on parts by using the Crop tool with the Histogram open, but the histogram is only updated when the crop is committed, so trial attempts have to be made with the crop tool, and any which don't look good enough have to be reverted with Undo. Would it be possible to make a tool which works this way (doesn't have to be Crop) but which allows trial measurements on selected areas? It is possible to have the Histogram open as well as one of the Scope tools, but would it be possible to have more of the Scope tools open at the same time? Not so good on a laptop, but on a large screen would be little problem. Lastly, re the selective measurement (crop) idea above. Some of the Scope tools don't work so well with a reduced area - unless the Gain is turned up. The max gain seems to be 500% which might not be enough for some small areas. Is there anyway of automating this so as to avoid having to manually turn up the gain in order to see any useful result? Should be possible, surely.