Patent ID: 6148158
Filing Date: 2000-11-14
Classification: G03G

Abstract:
An image processing apparatus having a reader for reading an original image and a plurality of image forming units for performing image formation using predetermined colors, comprising:pattern data output means for outputting pattern data to each of the image forming units to cause the image forming units to form pattern images;pattern image density measuring means, including a plurality of measuring units, each unit corresponding to a different color, for measuring densities of the pattern images formed by the respective image forming units to obtain pattern image density data;gradation correcting means for performing gradation correction of image data to be output to each of the image forming units;control means for controlling correction characteristics of said gradation correcting means in accordance with the pattern image density datareading characteristic correction means for correcting reading characteristics of each of said measuring units in accordance with pattern image data read by using said reader of pattern images formed on a recording medium and the pattern image density data obtained by said pattern image density measuring means.