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-1

The value of “72 pixels per inch” does not actually refer to a display with 72 pixels per inch. It means “1:1 pixel ratio” or “show each pixel of this image on one pixel of the display.” It is essentially a zero point on the resolution ruler. So when you don’t care to specify a pixel per inch setting, you use 72 pixels per inch.


2

As you said, the ppi is irrelevant, because you're not actually printing anything. For your purposes, ppi is just a meta-tag that won't change anything. (See https://bjango.com/articles/ppiisatag/) I would just leave it at the default of 72.



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