Contrast and brightness is required to adjust the sharpness and brightness of an image. In analyzing the image with a certain contrast and brightness required a good method, so that get accurate results. One method is using viola jones, this method can be used to detect a pictorial image. In this final project research to be detected is the image of facial acne is done by changing the value of contrast and brightness values, the result of changes made as many as 110 data. The results of this study indicate that changes in brightness and contrast values greatly affect the outcome of the image detection method jones viola and showed that the higher the brightness and contrast it is increasingly difficult to detect the acne on that image.
Keywords: Brightness, Contrast, objects, images, acne, and methods viola jones.