As can be seen, the output values of NAND are simply the inverse of the corresponding output values of AND.
The AND (and similarly the NAND) operator typically takes two binary or integer graylevel images as input, and outputs a third image whose pixel values are just those of the first image, ANDed with the corresponding pixels from the second. A variation of this operator takes just a single input image and ANDs each pixel with a specified constant value in order to produce the output.