To obtain high quality images from a camera, a few basic rules apply. These rules are equally applicable to network cameras as they are to any other type of camera.
When possible, use lots of light!
The most common reason for poor quality images is a lack of light. Generally, the more light, the better the images. With too little light, the images will become blurred and dull in color. Professional photographers always use strong lamps.
Lux is the standard unit for measurement for light. The table below shows how much light you can get in different kinds of conditions:
Strong sunlight 100,000
Full daylight 10,000
Normal office light 500
Poorly lit room 100
At least 200 lux is needed to capture good quality images. A high-quality camera might be specified to work down to 1 lux. This means you can capture an image at 1 lux; not that you will get a good image at 1 lux. Different manufacturers use different references when they specify the light sensitivity, which makes it hard to compare cameras without looking at captured images.
Avoid back light
Bright areas in the images should be avoided. Bright images might become overexposed (bright white) and objects can then appear too dark. This problem typically occurs when attempting to capture an object from behind a window.