Quote:
Originally Posted by kovidgoyal
there is no code in calibre to manipulate the dpi stored in jpegs. In fact, I wasn't even aware that jpegs could store dpi. What would be the point of storing dpi in raster format?
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It is used for deciding how to 'display' images on devices with differing resolutions while maintaining the same physical size. For example, when photoshop prints a 5x7 photo, it will be 5x7 no matter the printer resolution and no matter the paper size (as long as the paper is larger than 5x7).