I don't understand this.
  AFAIK the dpi value in an image format (if the format supports it) is
just a value. It doesn't affect anything. The image will still have the same
amount of pixels and wouldn't care less about some value in its header
called "dpi".
  If you want to change that dpi value, then just open the file with a
paint program and change that dpi value. What's the problem? If that value
has some effect when printing then it may be relevant, but it's completely
irrelevant with respect to the image file itself.
  If you want more accuracy, render your image with more pixels.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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