Patent ID: 6172767
Filing Date: 2001-01-09
Classification: G06T,H04N

Abstract:
An image forming apparatus comprising:an image signal input section to which an image signal is inputted;an image forming device which forms gradation pattern images, corresponding to at least a first color and a second color, by means of said image signal;an image recording device which overlaps said gradation pattern images to form a multi-color image;a controller which is capable of controlling said image forming device so that:a first gradation pattern image for said first color is formed by aligning a plurality of first unit gradation patterns alone one screen angle, wherein each said first unit gradation pattern is constituted by dots that extend linearly in a first direction corresponding to a first screen angle; anda second gradation pattern image for said second color is formed by aligning a plurality of second unit gradation patterns along another screen angle which is different from said one screen angle, wherein each said second unit gradation pattern is constituted by dots that extend linearly in a second direction corresponding to a second screen angle, wherein said second direction is substantially perpendicular to said first direction.