Mikko Koppanen has posted another quick hit ImageMagick hint to his blog - this time it deal with "seam carving", a process for cropping and resampling of an image to make a different composite picture.
Today I was reading trough the ImageMagick ChangeLog and noticed an interesting entry. "Add support for liquid rescaling". I rushed to check the MagickWand API docs and there it was: MagickLiquidRescaleImage! After about ten minutes of hacking the Imagick support was done. Needless to say; I was excited
You'll need to have the libqr library compiled into the ImageMagick installation, but the actual use of the functionality is simple - about three or four lines do the work for you. He includes the original image and the result from his test (as well as another example of the same result image scaled down automatically.