Hi, You may want to have a look at ShaFFT:
http://www.ibg.uu.se/static/exjobb/00/00005.pdf (the undergraduate project write-up)
You can download the program from ftp://xray.bmc.uu.se/pub/alwyn (file is shafft_export.tar)
Cheers, Martin On Feb 19, 2007, at 4:35 AM, Bernhard Rupp wrote:
Dear All: I am trying to make FFTs of images of assemblies of spheres and other shapes to explain diffraction, the usual thing. So far I do this through cumbersome cludges, and I bet there are better ways, and I am looking for free or cheap software to do this. I load the image into basic mathcad, dump it as a grayscale array, SFT it with a F90 kludge (s=slow), and load the transform back into MC and convert it into an image. However, what I also want to do is generate a false color diffraction pattern where the color is the phase. I believe this is quite similar to the Fourier duck transforms Kevin Cowtan made. I also recall a textbook were two crystallographers were phase exchanged, so there got to be packages that to what I want. The mathcad image processing module is too expensive for my taste. Any suggestions for software - maybe there is some software out already to simulate diffraction from one, 2, 3 an array of objects? Cheers, br -------------------------------------------- Bernhard Rupp www.ruppweb.org --------------------------------------------
. B. Martin Hallberg, PhD Molecular Cell Biology Program Department of Cell and Molecular Biology Karolinska Institute Nobels väg 3 SE-171 77 Stockholm +46-704-242094
