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The use of digital images is increasing because of the advantages possessed by digital images, among others, in the picture, reproduce images, image processing and others. But not all digital images have a visual appearance that satisfies the human eye. Dissatisfaction can arise due to noise, lack of illumination quality in the images where it either too dark or too bright. So we need methods to enhance the quality of digital images. To enhance the image quality from the red color side we can give care to the histogram. The treatment referred to in this article is an image equalization histogram at the gray level (grayscale). A good picture histogram when it involves all possible levels or levels on a gray level. Of course the goal to be able to display the detail on the image for easy observation. One method to improve digital images is to use the equalization of histogram method, where the level or gray in the image can the spread evenly across all levels of gray.