title: What does bit per color channel means?
body: <p>Determine the number of bytes necessary to store an uncompressed RGB color image of size 640 ×
  480 pixels using 8, 10, 12, and 14 bits per color channel?
  I know how to calculate the size of image by using Size = (rows * columns * bpp) but i cannot understand what bit per color channel means in this question</p>