METHOD AND APPARATUS FOR HIGH QUALITY PRINTING OF NON-SATURATED COLORED TEXT AND LINES

摘要

An embodiment implements a methodology for printing non-saturated text and lines in a way that removes the jagged edge problem. An embodiment uses a combination of two screens, e.g. AM screening and applying pure color. For example, according to the embodiment, the closer to the edge from the interior of text or lines, the less amplitude modulation half toning is applied and the more actual color or contone is applied. A particular algorithm for determining and using a blending parameter is provided.

主权项

1. A computer-implemented method for printing non-saturated text and lines, comprising the steps of:
determining D, a distance within which is considered close to an edge, wherein one end of D is referred to as DMAX and the opposite end of D is referred to as DMIN; providing a blending parameter, α, that is equal to zero at DMIN and is equal to one at DMAX; for each pixel:
determining a distance to the edge;in response to determining the distance to the edge, assigning a value to α that is between zero and one or equal to zero if the distance is DMAX or one if the distance is DMIN;in response to assigning the value to α, evaluating, using α, a combination of an amount of a first screen and an amount of a second screen; andin response to evaluating the combination, printing said pixel using said combination on an eletrophotographic printer; wherein the steps of the method are performed by one or more computing devices.