A document containing colored strokes or lines is reproduced in a way to preserve the color intent if the reproduced document is copied on a black-and-white device. Dashed lines are generated for insertion into the stroke, with dashing patterns that reflect the original color of the stroke. Outlining...http://www.google.fr/patents/US6179485?utm_source=gb-gplus-shareBrevet US6179485 - Printing black and white reproducible colored stroke documents
Printing black and white reproducible colored stroke documents