Xerox 480cx User Guide

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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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