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iStockphoto Tip: Digital images are composed of tiny dots known as pixels. When talking or reading about the image resolution of stock pictures, you will likely see a number prior to the phrase "dots per inch." For example, 100 dpi or 300 dpi. This refers to the number of pixels per square inch, which will be used when the image is printed. So, supposing you print an image at 4"x6", the 300 dpi version will be significantly sharper than the 100 dpi version, because more pixels are used in the same amount of space. 300 dpi images are perfect for printing, whereas a 100 dpi or even 72 dpi image looks fine on a computer.