This paper presents a method to compute a linearization stage that may increase accuracy on lookup based RGB to RGB color transforms as implemented in Application Specific Integrated Circuits (ASIC). While the use of a prelinearization stages is a well know topic (1), there is few literature on how to build such curves. The method presented here is accurate, computationally efficient and cheap in terms of implementation. It is especially effective when apparent gamma of input and output RGB spaces are quite different. On the paper, the effect of this algorithm on linearization stage in RGB to RGB color transforms is evaluated theoretically and experimentally though psychophysical testing using real images. Both theory and the test results confirm a significant performance increase in terms of image quality.