Color image reproduction apparatus, including a video monitor and a computer-based workstation, provides for modifying an original color image read from an input film and for writing a reproduced image on an output film. A plurality of digitally operated look-up tables (LUTs), associated with the workstation, serve for transforming original imaging data to a common color space (CIELUV L* u* v*) and for transforming reproduced imaging data to different use-dependent RGB color spaces, e.g. video monitor, output film, etc. Color image values stored in each LUT are altered from exact color image values by means of a least squares algorithm to provide an average error of zero--an unbiased error--for linearly interpolated values derived from each LUT.