Patent ID: 9578205
Date: 2017-02-21
CPC Classifications: G03F,G06K,H04N

Claim:
1. A method of forming a halftone screen, the method comprising: representing a first tone range by forming a plurality of dots arranged in a grid; representing a second tone range by forming a plurality of substantially cross-shaped dots arranged in a grid, the cross-shaped dots contained within respective dot cells and having four arms, a distal end of at least one of the arms wider than a proximal end, the second tone range darker than the first tone range; and representing a third tone range by forming a plurality of substantially cross-shaped dots arranged in a grid, the cross-shaped dots representing the third tone range contained within respective dot cells and having four arms, a proximal end of at least one of the arms wider than the proximal end of at least one arm of the cross-shaped dots representing the second tone range, the third tone range darker than the second tone range; wherein the cross-shaped dots representing the second tone range or the cross-shaped dots representing the third tone range define a plurality of substantially cross-shaped non-printed areas.