Question: what is the difference between pixel and bit?
Answer: Each pixel typically consists of 8 bits (1 byte) for a Black and White (B&W) image or 24 bits (3 bytes) for a color image-- one byte each for Red, Green, and Blue. 8 bits represents 28 = 256 tonal levels (0-255). ... Digital images are obtained from digital cameras or by scanning film or prints.