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Tone Curve
The Tone Curve tool lets you adjust the tonal range of an image. However,
instead of making adjustments using just three variables (highlights, shadows,
and midtones), you can adjust any point along the 0-to-255 scale (for 8-bit
images; 0-to 4096 scale for 12-bit images).
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How to Read the Curve
The Curve shows the relationship of the brightness changes across the middle
pixels between the resulting image and the original. When you open the Curves
dialog box, the line on the graph is diagonal because the Input and Output
values are the same.
When the curve is moved up or down, the relationship between input value and
output value changes accordingly.
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Microtek ScanWizard Medi Reference Manual
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