If you use LCD monitor, you should to be aware about defective pixels which might be exist on your LCD screen. Defective pixels are pixels on LCD screen which not performing as expected. Its failing to reproduce the right light levels. There are three kinds of defective pixels:
1. Dead pixels : pixels that always off.
2. Hot pixels : pixels that always on.
3. Stuck pixels : pixels countain one or more sub-pixels that always on or always off.
Checking defective pixels on your LCD screen is not easy. But it could be easier when you check it on 5 color modes like red, green, blue, white and black.
Defpix is a software that lets you to check defective pixels easily by showing those colors. After you download Defpix, you can use it without any installation. Once you open Defpix, it will change your LCD screen color to red, green, blue, white and black. You can change each colors by clicking the right/left mouse button.
Defpix is a freeware which you can download from this link below: