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Chapter 1. Getting Started with Photosho... > Changing Image Size and Resolution

Changing Image Size and Resolution

You can modify the size and resolution of a document after opening. However, be aware that changing the size and/or the resolution of an image forces Photoshop to add or subtract pixels from the image in a process called interpolation. For example, when you change the resolution of an image from 72 ppi (pixels per inch) to 144 ppi, Photoshop must add more pixels. Conversely, if you reduce the resolution, Photoshop must remove pixels. The image interpolation method determines how Photoshop completes this process. You can use the Nearest Neighbor method for the fastest way, but it produces the poorest visual image. Or, you can use the Bicubic Sharper method which takes the longest to perform, but produces the best visual results.


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