Bernhard,
I've used Matlab to calculate 2D FTs (eg, a Cowtan-esque FT of a
cat). I'm sure you could come up with a way to do the phase
coloring without too much sweat--the degree of flexibility available
to you in this program is quite large. My university has a campus-
wide license for Matlab, so it's *free* for me...I have no idea of
what it would cost to purchase.
Pat
On Feb 18, 2007, at 10:35 PM, 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
--------------------------------------------
------------------------------------------------------------------------
---------------
Patrick J. Loll, Ph. D. (215) 762-7706
Associate Professor FAX: (215) 762-4452
Department of Biochemistry & Molecular Biology
Director, Biochemistry Graduate Program
Drexel University College of Medicine
Room 10-102 New College Building
245 N. 15th St., Mailstop 497
Philadelphia, PA 19102-1192 USA
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