User`s manual

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When the value of highlight and shadow change, the image changes
accordingly.
Highlight: 255/Shadow: 0(Normal)
Highlight: 210/Shadow:10
Highlight: 200/Shadow:0
Highlight: 255/Shadow: 50
Adjusting the Brightness Curve
Adjusts the midtones of the image without dramatically altering then
lightest and the darkest areas.
Adjust the curve to make a brighter or darker
image.