I need a 50×50 mm, 600×600 pixel (digital) picture for my passport. What the hell does that mean? If I’m looking at it on my pc I can make it 50×50. But if I open it in my phone it’ll be 5×5, if I open it in a bigger monitor it’ll be 100×100. How do I know what display they’ll be looking at it on?
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Simply resize it to 600 x 600 pixels in a painting program. Then set the print resolution to 12 pixels/mm. 300 DPI (dots-per-inch) would probably be close enough too.
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