Epson STYLUS SCAN 2500 User Manual page 157

Click the Color Adjustment button on the Advanced menu to
view the following dialog box.
Note:
If the Image Type setting is not Color Photo, or Color Photo
De-Screening, or the Pixel Depth is set to 8-bit Gray or Black
& White, the Color Adjustment button appears dimmed and
these settings cannot be selected.
You can see the effects of the Color Adjustment settings in the
Preview window.
Gray Balance Intensity:
Gray Balance Intensity removes unwanted color casts and
tints by balancing color saturation.
Click the eyedropper button beneath the slider. The mouse
pointer changes to an eyedropper. Then click the color you
want to be gray. The eyedropper "picks up" the color and
displays it in the box beside the eyedropper button. You can
then correct the cast level for that color from 0 to 100 by
moving the slider. The corrected color appears in the box on
the right, and the effect shows up immediately in the preview
image. Click Cancel to restore the original image.
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