Patent ID: 8477324

Claim:
An image processor, comprising: a determining unit that determines whether an input image signal including a plurality of color signals indicates either one of a color image and a monochrome image; a processing mode selecting unit that accepts a selection of a color processing mode for applying a color image processing and a monochrome processing mode for applying a monochrome image processing; and a processing unit configured to execute an image processing unit that applies an image processing of any one of a color processing and a monochrome processing to the input image signal, the image processing unit including a gamma converter that applies a gamma conversion processing to the input image signal for adjusting a grayscale, wherein, when the processing mode selecting unit accepts the selection of the color processing mode and the input image signal has been determined to indicate the monochrome image, the gamma converter applies a gamma conversion processing using a first S-shaped gamma curve that is concave in a highlight portion and an intermediate portion and is convex in a shadow portion, and, when the processing mode selecting unit accepts the selection of the monochrome processing mode and the input image signal has been determined to indicate the color image, the gamma converter applies a gamma conversion processing using a second S-shaped gamma curve that is concave in a highlight portion and is convex in an intermediate portion and a shadow portion.