Was to adjust the brightness of the main display, it is a simple app. Left 4 Dead 2 Black Box Repack Youtube. We are equipped with a filter function, you can dim the screen beyond the brightness of the display. ✓ Image filter function. The effect of filter software, you can dim the screen beyond the minimum luminance of the display. Please use it if you feel bright and a display by the scene, for example, if you want to prevent prying eyes from the surroundings. With just a touch of a seek bar, which is also features that you can adjust the intensity of image effects filters and seamlessly adjust the brightness of the standard. Due to limitations in the state of security in terms of Android OS, image filter is applied should be noted that you can not install app 'unknown sources' that you downloaded from non-Google Play Store.