Instruction manual

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This histogram shows a good distribution of tones, from deep shadows on the
left to bright highlights on the right. This indicates the image has a lot of contrast.
[The following is courtesy of Vincent Bockaert, at 123di.com]
Histograms are the key to understanding digital images. This 10 x 4 mosaic
contains 40 tiles which we could sort by color and then stack up accordingly. The
higher the pile, the more tiles of that color in the mosaic. The resulting
"histogram" would represent the color distribution of the mosaic.