The color image forming apparatus, the density deviation correction method and the density deviation correction program

摘要

PPROBLEM TO BE SOLVED: To provide a color image forming apparatus which achieves reduction in color shift by skew correction by image shifting and which does not carry out excessive correction of a striped noise image caused by density shift due to the skew correction. PSOLUTION: The density correction part 1353 of a skew correction processing part 135 includes; a function which calculates a density value which is obtained by adding an image density data value in a marked region comprised of pixels in a prescribed region with the marked image as a center which is in contact with an image shift position when image data are shifted by using shift correction information and the image data, a function which detects whether a local increase or decrease in the density occurs in the marked pixel due to variation in adjacent relationship of pixels, a function which decides whether or not the density value in the marked region is within a density region where density correction is not needed, and a function which executes density correction processing for the marked pixel or the pixel adjacent to the marked pixel when the density correction is needed as the results of the decision. PCOPYRIGHT: (C)2009,JPO&INPIT