Xerox DocuMate 510 Installation Manual page 36

DocuMate 510 Scanner Installation Guide
To adjust the highlight and shadow levels:
1. Click the Highlight/Shadow button.
The dialog box that opens shows a histogram of the saturation,
gamma, and hue (S, G, H) of the range of colors for the
highlight and shadow.
Saturation is the strength or purity of a color, gamma controls
the brightness of the midtones of the color, and hue is the color
your eyes see as reflected from the image. The gamma setting
in this dialog box is in conjunction with the hue and saturation
but you can also set gamma by itself for an image. See the
section "Curves," below for more information
2. From the Channel drop-down list, choose RGB to adjust all the
channels together, or choose a single channel if available.
3. Enter new settings in the boxes for the three levels, or drag the
small triangles at the bottom of the histogram.
As you change the settings, the histogram changes to reflect
the new levels.
4. Click Preview to see the effect of the new settings on the
preview image.
5. Click Reset to reset the levels to their original values.
6. Click OK when the levels are what you want.
Curves
Like the Highlight/Shadow levels, the Curves feature also adjusts
the range of midtone colors on an image. However, with the Curves
feature you can set the gamma individually to adjust midtone levels
without losing details from the lightest or darkest areas.
Scanning Items
31