Question: what is the difference between 8 and 16 bit in photoshop?
Answer: In terms of color, an 8-bit image can hold 16,000,000 colors, whereas a 16-bit image can hold 28,000,000,000. Note that you can't just open an 8-bit image in Photoshop and convert it to 16-bit. When you create a 16-bit document, you are giving the document the 'space' to hold 16 bits of information.