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Tone curve and histogram corrections
The tone curve is a graphic representation
of the brightness and color levels of the
image. The bottom axis is the 256 levels of
the original image (input data) from black
Highlights
to white. The vertical axis is the corrected
image (output data) with the same scale
from top to bottom.
The bottom left portion of the graph repre-
sents the dark colors and shadow areas of
Midtones
the image. The middle section represents
the mid-tones: skin, grass, blue sky. The
top right section is the highlights: clouds,
lights. Changing the tone curve can affect
the brightness, contrast, and color of the
image.
Shadows
Input
Shadows
The histogram indicates the distribution of
Mid-tones
pixels with specific brightness and color
values in the image. Using the histogram
Highlights
can maximize the output of the image
data. Changes made with the histogram
are also displayed on the tone curve.
Luminance levels from 0 to 255
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