PPI (Pixels Per Inch) measures screen resolution density — how many pixels fit in one linear inch of a display. Higher PPI means sharper text and images. Apple branded 326+ PPI as 'Retina' — the point where individual pixels become indistinguishable at normal viewing distance.
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Pro Tip
For printing: 300 DPI (dots per inch) is the standard for photo quality. Web images are typically 72–96 PPI — they look sharp on screen but print blurry when enlarged.
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Did You Know?
The human eye can distinguish individual pixels at about 1 arcminute of visual angle. At 12 inches, this works out to ~300 PPI — hence Apple's Retina threshold. Sitting further from a screen makes lower PPI look acceptable.
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