The purpose of color image enhancement is to enhance the image contras t and improve the visual effect of color image on the premise of maintaining the hue.In this paper,a color image′ enhancement alg orithm based on wavelet transform is proposed.In RGB color space,each channel is decomposed by wavelet transform,and the high frequ ency compenent is enhanced by nonlinear function to highlight the details.and the image is reconstructed by inverse wavelet transfor m,Then,the enhancement factor is calculated by comparing the image with the original image after histogram equalization,and th e gamut problem is processed to obtain the hue preserving enhanced image.The performance of the algorithm is compared with oth er color image enhancement algorithms under the same conditions.Experimental results show that the algorithm has good enhanceme nt effect on color images with different quality, enhances image details and contrast,and has adaptive ability.