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Install libIlm and openEXR from http://openexr.com/downloads.html
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Install pfstools (make sure EXR support is installed) from http://pfstools.sourceforge.net
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Add path to
<pfstools>/src/matlab -
Install dcraw from http://www.cybercom.net/~dcoffin/dcraw/ and make sure it is in the path, so you can call it from within Matlab.
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Profit!
Note to Mac users: install gcc and compile all of these with it. It's way easier than using llvm as pfstools hasn't been tested with it (apparently).