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To improve the ability of color discrimination for dichromats and preserve the naturalness of the original images, a color image transformation method is proposed based on an improved adaptive mapping algorithm. Using the transformation, the color space of ordinary vision is mapped to the color plane of dichromats to avoid the main color confusion for dichromats. Experiments are conducted on both 15 color test images and 5 natural images. The results show that the invisible information for dichromats in original images stands out in re-colored ones so that the color information readability for dichromats is enhanced. The performance of the improved method is much better than that of the original one.