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PPI Calculator & DPI Calculator
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Display distance, retina and dimension calculator.- RodrigoPolo.com
Print and Image Sizing Guidelines
FYI: Viewing distance where resolution becomes noticeable : r/xboxone
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![Distance, Resolution, and the Human Eye: An Exercise in Specifying the Right Display – rAVe [PUBS]](https://www.ravepubs.com/wp-content/uploads/2014/08/Board-Room-21.jpg "Distance, Resolution, and the Human Eye: An Exercise in Specifying the Right Display – rAVe [PUBS]")