For Epson Stylus Pro WT7900 printers, color libraries support definitions for white ink or opacity.
You can create a CMYKW (cyan, magenta, yellow, black, and white) color library and define how much white ink to use. You can also create a CIE L*a*b* color library and define the opacity of colors. (Opacity defines how much you can see through a color.) The Opacity option is only available for colors defined in L*a*b* color space.
For input files that contain content for white ink, Kodak Proofing Software uses recipes from color libraries to process the white content because white objects and separations are processed as spot colors. For example, if an input file contains an object or separation for white flood, the color library must contain a name and recipe for the white object or separation, and you must select the color library in the hot folder or virtual printer used to process the job. All objects or separations in the input file that use white ink must have a name and recipe defined in a color library in order to print the content with white ink.
Note: The name in the user library must exactly match the name of the color in the input file in order for Kodak Proofing Software to use the recipe definition.
CMYKW libraries use the White option to specify how much white ink to use. The White option must be set to 1 or higher in order for white ink to print. When you use a color library with a hot folder or virtual printer, the recipe for white flood should have the same number in the White option that is specified in the Optimal White Level option for the media configuration that is selected for the hot folder or virtual printer. You can view the Optimal White Level option in the Description area of the Media Configuration Manager for the selected media configuration with white ink enabled.
CIE L*a*b* libraries use the Opacity option to define opacity for white and colors. The Opacity option must be set to 1 or higher in order for white ink to print. When you select an L*a*b* library in a hot folder or virtual printer, Kodak Proofing Software uses the definitions from the L*a*b* library and the color space information from the proofer profile to transform the colors to the color space for the inkjet proofer. This method transforms the Opacity setting to ink values that can be used for white ink.
Kodak Proofing Software includes a White Level and Opacity Chart that you can print to help identify a white level and opacity. See the White Settings tab in the hot folder or virtual printer.