A common requirement in the different color systems is “how to interchange a device independent color” The major objective of PRISM processor is to answer this requirement. In order to exchange the colors between different systems, a device dependent signal to/from the system must be converted into a device independent standard signal. The novel algorithm, “PRISM (Programmable Interpolation by Small Memory)” has been proposed. It has the following features to be applied for• Device independent color interchange.• Simple structure for LSI chip design.• Reduced computations for real time operation.• User definable applications.