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In order to improve image quality,a novel Retinex algorithm for image enhancement was presented Different from conventional algorithms,it was based on certain defined points containing the illumination information in the intensity image to estimate the illumination.After locating the points,the whole illumination image was computed by an interpolation technique.When attempting to recover the reflectance image,an adaptive method which can be considered as an optimization problem was employed ;to suppress noise in dark environments and keep details in other areas For color images,it was taken in the band of each channel separately Experimental results demonstrate that the proposed algorit is superior to the traditional Retinex algorithms in image entropy.