Patent ID: 8482804

Claim:
An image processing apparatus that performs processing of image data pixel by pixel, the apparatus comprising: an image determination unit configured to determine whether the pixel of a processing object belongs to a non-photographic region of a character or a line or a photographic region of a photograph; a value modulation unit configured to modulate a signal value of a pixel, which has a signal value within a predetermined range, of the pixels of the processing object; and a processing unit configured to change a signal value of the pixel of the processing object which has a signal value within a predetermined range into a predetermined signal value, wherein in a case that the pixel of the processing object belongs to the non-photographic region of the character or the line, the value modulation unit does not perform the modulation of the signal value of the pixel and the processing unit performs the processing of the signal value of the pixel, and in a case that the pixel of the processing object belongs to the photographic region of the photograph, after the value modulation unit performs the modulation of the signal value of the pixel, the processing unit performs the processing of the signal value of the pixel.