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This question already has an answer here:

I specialize in macro photography and I've recently begun to export in 300-350dpi, as I find it does a better job of representing details (crucial to my work).

However the file size is small, eg. 1200px.

Am I compromising my image's safety? (given watermarks can be removed and files can be enlarged easily)

marked as duplicate by Michael C, mattdm, Community Oct 13 '17 at 12:04

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An image doesn't have a DPI until you print it.

All it has are dimensions in pixels.

Anything else is simply an interpolation of one system to another in order to display on your screen... which is probably about 72dpi anyway.

If your image is 6000 x 4000 pixels, then that's its size, whatever dpi you think you may have saved it at.

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    An image doesn't have a DPI until you print it. +1. About the most succinct way I've seen it put. – scottbb Oct 13 '17 at 17:41

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