Microtek ArtixScan 4500t Reference Manual page 101

Color Cast tool continued...
It is more convenient to use the Color Cast Eyedropper tool in removing or a
adding color cast. Click the Color Cast Eyedropper in the Color Cast dialog box.
Then move to the thumbnail in the dialog box or the preview image in the
Preview window, and pick the color cast to be added or removed.
94 Microtek ScanWizard Pro for Macintosh
Use the Color Cast
Eyedropper to add or
remove a color cast.