Spot Color Mapping Using Media Information
Publication Date: 2005-Dec-15
The IP.com Prior Art Database
The invention describes a method for selecting the single spot color specification for each page printed based upon the media programmed for the page. For example, pages programmed on coated stock select the coated stock spot color variant while for pages programmed on uncoated stock select the uncoated stock spot color variant.
Spot colors – particularly the PANTONEÒ Matching System -- can have similar but distinct specifications or names (e.g., Pantone suffixes "C", "U", and "M" designate the same color for coated, uncoated, and matte papers). When specifying spot colors, document creators are often careless and apply variations of the spot color name to objects that are intended to have a consistent color. Because color Digital Front Ends and other rendering engines strive to reproduce each color with utmost fidelity, when a document contains such specification variations, they typically produce unintended variations in the resulting spot color appearance.
Two partial solutions exist to this problem: 1) Converge the spot color formulations so that all variations of a single spot color produce the same color, and 2) Converge all variations of a spot color specification to a single specification prior to the file reaching the color management module. Both solutions involve unconditional convergence to a color specification for a single media or paper stock; coated, uncoated, or matte stock. Unfortunately, because the spot color formulation must vary as a function of the media (coated versus uncoated) to produce optimal color fidelity, both approaches are suboptimal.
The invention is a method for selecting the single spot color specification for each page based upon the media programmed for the page. For example, pages programmed on coated stock select the coated stock spot color variant, while for pages programmed on uncoated stock select the uncoated stock spot color variant.
For each page within a document, the system would inventory the spot color usage, cluster the variant colors, determine the media type for page, determine the appropriate variant spot color for the media type, and apply/override all the variant colors with appropriate spot color specification.
This invention is a method for improving the consistency and accuracy of spot colors. The invention extends the Autoresolve Naming Conflicts feature found in the Heidelberg Color Editor Acrobat plug-in to comprehend media specification for the page.
In contrast to process colors, which are specified as a mixture of primary inks (e.g., a series of Cyan, Magenta, Yellow, and Black values for conventional offset printing), spot or solid ink colors are specified as a density of a single ink name. The names are chosen or derived from swatch or fanbook systems owned by color matching systems providers such as PantoneÒ, Toyo, and TRUMATCHÒ. Color matching system providers often sell inks.
Software applications used by creative professionals (e.g., Quark Xpress and Adobe InD...