There are several tweaks that you can make to improve the image quality of your projector. Keep in mind that if you are trying to maximize output using a cheap projector, there are not going to be many settings that you can adjust, so you will not have that many options.
Improve Picture Contrast, Blackness, And Brightness
When we are talking about black on a projector, we are talking about the lack of light. When we are talking about brightness, we are talking about maximum light output. The first step is to figure out what type of lighting you’re going to have in the room.
If you’re going to use the projector in a completely dark room, then you want to adjust the contrast, blackness, and brightness in that atmosphere. If you are going to have ambient light, then make adjustments in that setting.
These calibrations should be done in cinema or movie mode. You want to find a scene that has plenty of black, such as a space backdrop in a Star Trek or Star Wars movie. You want to adjust the brightness dial until the overall image is bright, but the black parts of the image are convincing. In a space backdrop, the darkness of space should be black, but you should still be able to make out the individual stars.
When calibrating the contrast slider, you may want to use a scene that has a sky full of white clouds. You will adjust the contrast slider to the point where the white clouds retain their brilliance, but their detail is seen.
See Full Story at bitrebels.com