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Histograms

Histograms are graphs that display the distribution of tones and colors in the scanned image. Dark tones are indicated at the left end of the x-axis of the graph, light tones at the right end, and midtones are in the middle.

There are four different histogram graphs available in VueScan and these can be displayed in the Options panel by selecting one of the Image | Graph ... options from the Image menu.

Here's a description of what each one does: