The pixel value is a stored value that records the amount of brightness that the pixel is emitting and what colour it should be. If one is working with 8 bit , the amount of colours can be that of 255. If the pixel is set at 0 it will display as black while if it is set to 255 it will display as white.
Every image on the screen is made up of pixels and when all this are set to their correct pixel values the image will form and displayed as it should.
http://homepages.inf.ed.ac.uk/rbf/HIPR2/value.htm
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