Patent ID: 7809186

Claim:
An image processing apparatus comprising: input means for inputting original image data, which is obtained by digitalizing an image signal that has been converted from light from an object to an electric signal by an image sensor, and performing no compression or lossless compression; image processing parameter input means for inputting a first luminance parameter and a first chrominance parameter in accordance with an operation by a user; image processing means for performing, as the image processing, a conversion processing in which the original image data input by said input means is converted to an original luminance signal and an original chrominance signal, a luminance adjustment processing in which the original luminance signal is adjusted in accordance with the first luminance parameter and a chrominance adjustment processing in which the original chrominance signal is adjusted in accordance with the first chrominance parameter; storage means for storing the original luminance signal of the original image data, the original chrominance signal of the original image data, the adjusted luminance signal of the original image data, and the adjusted chrominance signal of the original image data individually, as a plurality of intermediate results of the image processing by said image processing means; first reuse control means for, when said image processing parameter input means inputs a second luminance parameter different from the first luminance parameter but does not input a second chrominance parameter different from the first chrominance parameter, controlling to generate a new processed image data of the original image data by causing said image processing means to perform the luminance adjustment processing to the original luminance signal stored in the storage means in accordance with the second luminance parameter and using the adjusted chrominance signal stored in the storage means; and second reuse control means for, when said image processing parameter input means inputs a second chrominance parameter different from the first chrominance parameter but does not input a second luminance parameter different from the first luminance parameter, controlling to generate a new processed image data of the original image data by causing said image processing means to perform the chrominance adjustment processing to the original chrominance signal stored in the storage means in accordance with the second chrominance parameter and using the adjusted luminance signal stored in the storage means.