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By varying the Shadow points and Highlight points you can
change the relative shades and highlights of the image. The
Shadow point represents the darkest value and the Highlight point
is the brightest value.
The Midtone point represents the Gamma setting for your
particular screen. On the histogram, the Shadow and Highlight
scales are divided into 255 units.
Therefore, all pixels in the original that are darker than the current
shadow point are now completely black in the enhanced image.
Level
Adjustment
tab
Shadow
control
Highlight control
Midtone (Gamma)
control
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