Patent ID: 6795214
Filing Date: 2004-09-21
Classification: H04N

Abstract:
A method of generating trapping contours in a page provided in the form of digital image data, for ameliorating disturbing effects of misregistrations in a printing machine, the method which comprises:moving a window over the image data of the page pixel-by-pixel, wherein the window contains a center pixel and neighbor pixels premarked for further processing; determining respective dark values for the center pixel and for the premarked neighbor pixels from color separation proportions; determining a darkest color separation for the center pixel and for the premarked neighbor pixels; comparing the dark values and the darkest color separations of the center pixel and of the premarked neighbor pixels for selecting particular pixels from the premarked neighbor pixels; calculating a trapping color from the selected particular pixels; comparing the color separation proportions of the center pixel with the corresponding color separation proportions of the trapping color and correspondingly modifying the color separation proportion of the center pixel.