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Level Adjustment
The Level Adjustment dialog box shows the distribution of brightness
levels in your image. To adjust the histogram plot, drag the triangles
located below the horizontal bar to the desired values. The left (black)
triangle changes the shadow levels. The right (white) triangle changes the
highlight levels. The middle (gray) triangle controls the midtone levels.
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.
Level
Adjustment
tab
Shadow
control
Highlight control
Midtone (Gamma)
control
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