We describe some observations on the practical implementation of the median cut color quantization algorithm, suitably modified for accurate color rendering. The RGB color space is successively divided in such a way that colors with visual significance, even if relatively small in population, are given representatives in the colormap. Appropriately modified, median cut quantization is nearly as good as our best octree quantization. As with octree quantization, error-diffusion dithering is useful for reducing posterization in large regions with a slow variation in color.