Epson Stylus Pro 4000 Reference Manual page 214

Color Controls
Select this setting to use the color matching and adjustment
methods provided with the printer.
Gamma
Controls image contrast by modifying the midtones and
mid-level grays
Mode
Photo -realistic
Vivid
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Printing with Mac OS X
Increases the contrast in an image. Use this setting for
color photographs.
Intensifies the colors and lightens the midtones and
highlights of an image. Use this setting for presentation
graphics, such as charts and graphs.