To convert an image into a monochromatic color tone corresponding to the designation of a user.

On the basis of a monochromatic color tone determined by a color tone determination unit 103b in accordance with the designation of a user, a γ curve optimization unit 103c optimizes a γ curve to be loaded to the image. An image processing circuit 103a performs image processing using the γ curve optimized by the γ curve optimization unit 103c, thereby converting the picked-up image into a monochromatic color tone such as sepia.

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