COLOR REGISTRATION ERROR COMPENSATION IN COLOR PRINTING

摘要

A multicolor image can include multiple overlaid items including a black region covering a color region. Raster image processing adds the color data to color pixels of the raster data print page uniformly across the area of the raster data print page that corresponds to the color region of the multicolor image, and adds the black data to over-print pixels (where the black region covers the color region in the multicolor image). Such over-print pixels include both the color data and the black data. The color data (but not the black data) is removed from the over-print pixels that are positioned a preset pixel distance from non-black color pixels. The raster data page is output from the processor device to a printing engine, and the printing device prints the raster data page on print media to produce a physically printed reproduction of the multicolor image.

主权项

1. A raster image processing device comprising:
an input/output device receiving print data to print a multicolor image, said multicolor image including a black region covering a color region; and a processor device operatively connected to said input/output device, said processor device raster image processing said print data to assign black data and color data to pixels of a raster data print page, said raster image processing comprising said processor device:
adding said color data to color pixels of said raster data print page uniformly across an area of said raster data print page corresponding to said color region of said multicolor image; andadding said black data to over-print pixels of said color pixels to include both said color data and said black data within at least one of said over-print pixels, said over-print pixels being located in an over-print region of said raster data print page corresponding to an area where said black region covers said color region in said multicolor image; after said raster image processing said processor device removing said color data from, and leaving said black data in, ones of said over-print pixels that are positioned more than a pixel distance from non-black color pixels, using said processor, and said processor device outputting said raster data page to a printing engine through said input/output device.