Look for webcam dvr software which allows you to adjust the images on each camera that you have on an individual basis. Although some of the more basic software applications will allow the system to automatically adjust the images being shown based on a pre set configuration, but it is not as good as being able to actually manually adjust the cameras for yourself. Also look for those software programs that allow you to not only adjust the resolution of the images but allow you to use other camera functions such as zoom, tilt or pan features.