All About Digital Photos - What is DPI? DPI stands for Dots Per Inch which technically means printer dots per inch.

A request for a 3. We could also look at it the other way - if the request is for a photo that will print to 3. But for sake of argument we can use 3. However there are other things that go into perceived resolution, most importantly the quality of the pixels. Lighting is critical but the advantage of good lighting can be blown by a bit of camera shake (camera/lens image stabilization helps but is no substitute for a steady shot). Item 4 is one that many amateur photographers aren't really familiar with and the one in which the most mistakes are made - the file format your photo is stored in.

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1. Online Convert DPI PPI to Pixel Calculate Pixel-DPI Pixel-PPI PPI-DPI-Conversion.
2. Scanners typically allow the DPI resolution to be adjusted via software. For best results, scanning should be done at the resolution of the intended output device.