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Abstract

A color signal transforming apparatus which is operable at high speed for four input signals including three color signals and a control signal for K, without increasing the memory capacity not so much. In the apparatus, each of four input signals is divided into the higher bits and the lower bits, so that the higher bits are combined to form basic data and the combined higher bits and lower bits are combined to form interpolation data. The combination of the higher bits and the interpolation data are calculated together to produce output signals. A 16-vertex body of each object to be interpolated is divided into twenty-four 5-vertex bodies each passing through one of sixteen lattice points constituting the 16-vertex body, and the different combinations of interpolation data is assigned to the 5-vertex bodies in one-to-one correspondence manner.

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First Claim