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When I open my curve tool I find there is a vertical line with the label 'x:193' where the number is a position on the horizontal axis. This position is never the same i.e. it varies from one image to another. I've tried to deduce what it means but am at a loss. Gimp context help provides no clues. Any suggestions?
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Welcome to gimp-forum.net
Which version of linux are you using and which version of Gimp?
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Yes, actually very useful for accurate work. You can re-click on the canvas to get the value for another pixel...