Image processing apparatus

Abstract

The image processing apparatus has nonlinear processing device that performs nonlinear processing on a digital color signal. The nonlinear processing device comprises gray region discriminating device which discriminates whether the digital color signals are present in a gray proximate region including gray signals and region correspondence nonlinear processing device which performs the nonlinear processing differently in accordance with cases where the digital color signals are discriminated as signals inside the gray proximate region being present in the vicinity of the gray signals or as signals outside the gray proximate region being not present in the vicinity of the gray signals by the gray region discriminating device. The image processing apparatus realizes a three-dimensional retrieving table (3D-LUT) which does not cause subtle variations different from its aim in the output signals only with a small addition of memory capacity to the ordinary memory, ensuring that the gray reproduction can be performed consistently and that photographic prints of high quality are produced in succession.

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