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What is the difference between DPI and pixels?

What is the difference between DPI and pixels?

Postby admin » Tue Dec 06, 2016 2:25 pm

A 720-pixels-wide image at 10 physical inches wide has a resolution of 72 pixels per inch. If you print it on a 1200 dpi printer, there will be 1200 dots per inch on the paper, but the image is still 72 pixels per inch. That's why it looks like crap. On the other hand, a 7200 pixels wide image printed at 1 inch wide will exceed the resolution of our 1200 dpi printer. Photoshop (let's say) and the printer driver decide which pixels to throw away and which to actually print. Some of the printed dots will be averaged among adjacent image pixels, but, regardless, some of the image information has to be thrown away. The output will be 1200 dpi, but the resolution of the printed image will have been reduced to at most 1200 dpi by the software.


Reference:
http://graphicdesign.stackexchange.com/ ... s-per-inch
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