here's the README file from the distribution:

Hi. This is superzoom. It is under the GPL license (see file LICENSE for details.) make sure you have FFTW (fastest fourier transform in the west) installed. it should be included in your distribution. for debian users: apt-get install fftw-dev make sure you have imagemagick installed. for debian users: apt-get install imagemagick type ./compile.sh now get yourself an image. then type ./scaleimage myimage.jpeg myoutput.png 2.35 the formats of input and ouput don't matter as long as imagemagick supports them. 2.35 means that the result will be 2.35 times the size of the source. how does it work? i build the two dimensional discrete fourier transform of the picture. then i zeropad the spectrum into the new size, or clip it if the result shall be smaller than the source. then i calculate the inverse two dimensional discrete fourier transform and that's the resulting picture. test it on sharp pictures or on photos. have fun with it. also check out the website http://www.erikyyy.de/superzoom/ to see some nice examples. cu Erik Thiele erikyyy@erikyyy.de

here is another example picture:

and yet another one (zoom factor 16 times):

(erikyyy at erikyyy dot de, Erik Thiele) | back |