Based on the huepreservation principle, images are transformed both in the RGB and CMY colorspaces;the enhancement methods in gray scale are generalized to the color space.

• 本文利用色调不变性原理,通过在RGB空间与CMY空间上的变换,将灰度图像的对比度增强方法成功推广到彩色图像增强处理中去。