Most scanners will usually scan in color when they acquire an image. While this is useful for photographs, if you have scanned a text document, then you only need the file to be stored in black and white. Color images take up more space than black-and-white images on your computer. So it is useful to reduce them in size so that you can distribute or store them more effectively. You can change a color photo to black and white using the Windows Live Photo Gallery, which is built into Windows. Writer Bio
