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6-42
The horizontal axis represents the original input brightness and the
vertical axis represents the enhanced brightness. Values on either
scale range from 0 to 255.
As shown in the figure below, if the curve is changed into a
convex shape above the original diagonal, the enhanced image
will be brighter than the original.
If the curve is changed into a concave shape below the original
diagonal, the enhanced image will be darker than the original.
Normal
Image
Lightened
Image
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