I didn’t know how to use them a few weeks ago, now the web seems to be overflowing with tutorials like this on histograms. I link to this one because it shows the multi-colour histograms available on some Canon cameras.
I noticed in the GIMP 2 that the Curves tool has a nice histogram in the background of it! Must figure out how to assign accelerator keys. It’s a Gnome FAQ so fire up Google later.
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