[magick-users] re size an image in centimeters?

[pere roca]

  hi everybody,
  I simply need to reduce the length of a very big image; I'm requesting to
a Geographic map service a 1440x720 pixel image so that, when user reduces
the image to a 7,5x3,75 cm (that's more or less 3x1,5 inches) in GIMP or
OpenOffice.. it gets about 480 dpi images (for printing). I want avoid the
user this final step (resizing) and serve a 7x3,5 cm image (I suppose it
would also reduce a lot the image size and increase performance).

  I see that resizing is only useful with pixels... how can I get it?
  thanks!

  Pere
  
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