For example, enlarging a digital image softens the image because Photoshop has to add image information to create the larger file. This procedure is known as interpolation and involves not only moving pixels around, but also adding and subtracting image information when necessary. When you resize an image in Photoshop (enlarge or reduce), you are actually resampling the pixels in the image.
It’s not hard to make the right decisions as long as you are armed with the right information. Making the correct choice is especially important when resizing images for print, as a bad digital enlargement or reduction can sometimes be unnoticeable on screen, but glaringly obvious on the printed page. Many people don’t know that when you resize an image using Adobe Photoshop, you have options that can dramatically affect the quality of the resulting image. In Images and Color Image Scaling Limitations: Interpolation Explanation
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