Patent ID: 6061533
Filing Date: 2000-05-09
Classification: G03G,H04N

Abstract:
An image forming apparatus for performing gamma correction based on an image density on a photosensitive body or an intermediate transfer body, comprising:test pattern generator means for generating a test image on said photosensitive body or said intermediate transfer body;a toner transfer section;first density detector means provided upstream of said toner transfer section with respect to a rotation direction of said photosensitive body or said intermediate transfer body, for detecting a pre-transfer image density on said photosensitive body or said intermediate transfer body before an image transfer at said toner transfer section;second density detector means provided downstream of said toner transfer section with respect to the rotation direction of said photosensitive body or said intermediate transfer body for detecting a post-transfer image density on said photosensitive body or said intermediate transfer body after said image transfer at said toner transfer section;corrector means for correcting image data; andcontrol means for calculating correction data for use in correcting said image data based on said pre-transfer image density data outputted from said first density detector means and said post-transfer image density data outputted from said second density detector means and for setting said correction data in said corrector means.