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58 ADVANCED IMAGE PROCESSING
A SHORT GUIDE TO HISTOGRAM CORRECTIONS
This guide shows simple corrections that can be made with a histogram. Unlike the tone
curve, the histogram provides information on a specific image. This can used to evaluate
the image and make adjustments accordingly.
The histogram of the cherry blossoms shows a gap at the right and the flowers look a
little grey. This is caused by slight underexposure when the image was captured.
By moving the highlight slider to the left to set the white point to where the pixel
distribution ends, the whites become more brilliant and the contrast increases.
This image is flat. The pixel distribution in
the histogram reflects the low-contrast
scene. The lack of any strong shadows or
dark tones is indicated by the absence of
pixels on the left of the histogram. Most of
the detail is concentrated in a narrow range
in the mid-tones.
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