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High DPI Monitors, Resolution Independance, The Web, and You

We all use 72 DPI as a defacto standard when creating web graphics (actually, "PPI" is the more appropriate acronym but rarely used). This used to be the actual resolution of monitors, but slowly over the years this has ceased to be the case. Take my iMac. The screen, straight across horizontally, is 22.5" and has 1920 pixels. That actually comes out to about 85 pixels per inch, not 72. When we design and test website all on the same … Read article