Patent ID: 7239427
Filing Date: 2007-07-03
Classification: H04N

Abstract:
1. A method of making correction for color sensor output values in color image forming apparatus having a color sensor to detect a color of patch formed on a transferring material by an image forming apparatus, said method comprising: a detecting step for detecting a patch formed on the transferring material and a transferring material by a color; a comparing step for making comparison between an output value obtained for the patch in said detecting step and a value at a boundary point in which a color of a transferring material affects a chromaticity of a patch; a correction step for, in the result of the comparison in said comparing step, in a case where a density of the output value for the patch is lower than the value at a boundary point, eliminating a value corresponding to an influence due to the transferring material from the output value of the color sensor for the patch, wherein said correction step is not executed in a case where a density of the output value for the patch is higher than the value at a boundary point.