Patent ID: 8094932

Claim:
A color image correcting apparatus, comprising: a high frequency image generating unit, which generates a high frequency image having a high frequency component extracted from a color original image which is represented by pixel values of a plurality of channels, for each channel; an average high frequency image generating unit, which generates an average high frequency image by assigning an adjusted pixel value to each of the channels at each pixel location; a low frequency image output unit, which generates a low frequency image having a low frequency component extracted from the original image; a correction image generating unit, which generates a corrected image of the original image by superposing the average high frequency image on the low frequency image; and wherein the average high frequency image generating unit determines, for each pixel location of the high frequency image, whether the pixel value of one of the channels of said each pixel location is less than a threshold, and in a case where the pixel value of one of the channels of said each pixel location is less than a threshold, the average high frequency image output unit uses the pixel values of the channels of said each pixel location as the adjusted pixel values of the respective channels of said each pixel location; otherwise the average high frequency image output unit uses the average of the pixel values of the channels of said each pixel location as the adjusted pixel value of each of the channels of said pixel location.