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A comment on First draft of HTML img srcset for responsive images. Parent comment

Re:First draft of HTML img srcset for responsive images by julian37 on Tuesday May 15, 2012 @05:47AM (#3975751)
PPI can be stored in the "pHYs" chunk in a PNG. And some image processing/editing tools do so, such as Photoshop starting with version 7.

http://www.libpng.org/pub/png/book/chapter11.html#png.ch11.d...

http://www.scantips.com/basics9p.html

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