COLOR IMAGE PROCESSOR

In multi-level error diffusion in an image processor, a quantization error data table is accessed at an address of data from a feedback adder, to output the data at the address as quantization error data. By using the table, the error is detected at high speed with an access time for the table. The quantization error is added to an input data by an adder after error integration with weights. Thus, the feedback calculation in multi-level error diffusion is performed at high speed, while the circuit structure thereof is simplified.