fabio.readbytestream

Package fabio :: Module readbytestream |
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# Module readbytestream

source code

    Reads a bytestream

    Authors: Jon Wright    Henning O. Sorensen & Erik Knudsen
             ESRF          Risoe National Laboratory

Functions | [hide private]
readbytestream(fil, offset, x, y, nbytespp, datatype=`'``int``'`, signed=`'``n``'`, swap=`'``n``'`, typeout=<type 'numpy.uint16'>) Reads in a bytestream from a file (which may be a string indicating a filename, or an already opened file (should be "rb")) offset is the position (in bytes) where the pixel data start nbytespp = number of bytes per pixel type can be int or float (4 bytes pp) or double (8 bytes pp) signed: normally signed data 'y', but 'n' to try to get back the right numbers when unsigned data are converted to signed (python once had no unsigned numeric types.) swap, normally do not bother, but 'y' to swap bytes typeout is the numpy type to output, normally uint16, but more if overflows occurred x and y are the pixel dimensions | source code

Variables | [hide private]
| logger = `logging.getLogger("readbytestream")`
| DATATYPES = ``{``(``'``double``'``,` `'``y``'``,` 4`)``:` <type 'numpy.float64'>`,` `(``'``flo``...``
| __package__ = ``'``fabio``'``

Function Details | [hide private]

### readbytestream(fil, offset, x, y, nbytespp, datatype=`'``int``'`, signed=`'``n``'`, swap=`'``n``'`, typeout=<type 'numpy.uint16'>) | source code
Reads in a bytestream from a file (which may be a string indicating a filename, or an already opened file (should be "rb")) offset is the position (in bytes) where the pixel data start nbytespp = number of bytes per pixel type can be int or float (4 bytes pp) or double (8 bytes pp) signed: normally signed data 'y', but 'n' to try to get back the right numbers when unsigned data are converted to signed (python once had no unsigned numeric types.) swap, normally do not bother, but 'y' to swap bytes typeout is the numpy type to output, normally uint16, but more if overflows occurred x and y are the pixel dimensions TODO : Read in regions of interest PLEASE LEAVE THE STRANGE INTERFACE ALONE - IT IS USEFUL FOR THE BRUKER FORMAT

Variables Details | [hide private]

  ### DATATYPES Value:
      {('double', 'y', 4): <type 'numpy.float64'>,
       ('float', 'y', 4): <type 'numpy.float32'>,
       ('int', 'n', 1): <type 'numpy.uint8'>,
       ('int', 'n', 2): <type 'numpy.uint16'>,
       ('int', 'n', 4): <type 'numpy.uint32'>,
       ('int', 'y', 1): <type 'numpy.int8'>,
       ('int', 'y', 2): <type 'numpy.int16'>,
       ('int', 'y', 4): <type 'numpy.int32'>}