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When the value of gamma changes, the image changes
accordingly.
Gamma value: 1.0
Gamma value: 1.4
Gamma value: 2.0
When the value of highlight and shadow changes, the image
changes accordingly.
Highlight: 255/shadow: 0 (normal)
Highlight: 210/shadow:10
Highlight: 200/shadow:0
Highlight: 255/shadow: 50
Chapter 4: Editing Your Image
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