Data reading problem

Fredrik Lundh fredrik at pythonware.com
Mon Dec 20 00:14:13 CET 2004


> if you need to read lots of 12-bit values, you can create a simple bitstream
> generator:

in private mail, Michal told me that his files were quite large, and that
the bitstream approach wasn't fast enough.

another way to do this is to use PIL's "bit" decoder:

    import Image
    im = Image.fromstring("F", (w, h), data, "bit", 12)
    im = im.convert("I") # convert to INT32
    seq = im.getdata() # get flattened sequence

where (w, y) is the width and height of a rectangle with the same size
as your data (if your data isn't rectangular, (size, 1) should work), data
is the raw data (size*12/8 bytes), and seq is a sequence object.

I'm pretty sure there are other toolkits out there that can do similar things;
any ideas, anyone?  (numpy/scipy?)

</F> 






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