Patent ID: 7804630

Claim:
An image processing apparatus comprising: discrimination means for discriminating an object of an input print job; and color conversion processing means for performing color conversion processing to the object based on a discriminating result of said discrimination means and information which designates color conversion processing set for each print job, wherein, when the object is a transparent object, said color conversion processing means executes the color conversion processing on a rendering color space, and when the object is a gradation object, said color conversion processing means executes the color conversion processing on a device color space, and wherein, when the object is the gradation object, the object is divided into a plurality of objects, color matching processing is applied to end points of the divided objects, and intermediate pixels are formed on the device color space, and wherein, when the object is the gradation object, a parameter used to designate the gradation object is input, a data group of the gradation object is formed by color matching processing based on the parameter and a trend changing of color values of the data group is inspected, and intermediate pixel values are calculated by an interpolation calculation from the data group, and when the intermediate pixel values do not monotonically increase or decrease according to the trend changing, the intermediate pixel values are corrected to monotonically increase or decrease.