A good way to check for item (0): 1. Point your camera phone to your computer screen and compare the brightness with the surroundings. The 2 levels should some

A good way to check for item (0): 1. Point your camera phone to your computer screen and compare the brightness with the surroundings. The 2 levels should somewhat match. 2. Adjust as needed. Often it is a matter of having proper lighting in the room. Most camera phones have very low dynamic range, so you'll instantly notice if the screen is way brighter (or darker) than the surroundings.