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

[Fred Weinhaus]

set the density

see http://www.imagemagick.org/script/command-line-options.php#density



>  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