I learned that a pure black and white image (just 2 shades: solid black 0,0,0 and solid white 255,255,255) is a one-bit image, because the pixel can either be black or white. When you move to gray scale channels, you have 8-bits per pixel. Each pixel can be 256 shades of gray. Why does the number come out to 8 for the bit depth? Is that how many binary numbers it takes to produce an integer between 0-255?