Given two input first one is a number which is uint8, second one is image which is 8 bit gray scale image, the image has pixsels which are also uint8 for example
first input is 4 if we convert it binary we get 00000100
also each pixsel is converted to binary format in the image
00000100 (OR) image(binary format) which produce output image that is the binary format
in the end output is converted to uint8.