Source code for PIL.FitsImagePlugin

#
# The Python Imaging Library
# $Id$
#
# FITS file handling
#
# Copyright (c) 1998-2003 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#

import math

from . import Image, ImageFile


def _accept(prefix):
    return prefix[:6] == b"SIMPLE"


[docs]class FitsImageFile(ImageFile.ImageFile): format = "FITS" format_description = "FITS" def _open(self): headers = {} while True: header = self.fp.read(80) if not header: raise OSError("Truncated FITS file") keyword = header[:8].strip() if keyword == b"END": break value = header[8:].strip() if value.startswith(b"="): value = value[1:].strip() if not headers and (not _accept(keyword) or value != b"T"): raise SyntaxError("Not a FITS file") headers[keyword] = value naxis = int(headers[b"NAXIS"]) if naxis == 0: raise ValueError("No image data") elif naxis == 1: self._size = 1, int(headers[b"NAXIS1"]) else: self._size = int(headers[b"NAXIS1"]), int(headers[b"NAXIS2"]) number_of_bits = int(headers[b"BITPIX"]) if number_of_bits == 8: self.mode = "L" elif number_of_bits == 16: self.mode = "I" # rawmode = "I;16S" elif number_of_bits == 32: self.mode = "I" elif number_of_bits in (-32, -64): self.mode = "F" # rawmode = "F" if number_of_bits == -32 else "F;64F" offset = math.ceil(self.fp.tell() / 2880) * 2880 self.tile = [("raw", (0, 0) + self.size, offset, (self.mode, 0, -1))]
# -------------------------------------------------------------------- # Registry Image.register_open(FitsImageFile.format, FitsImageFile, _accept) Image.register_extensions(FitsImageFile.format, [".fit", ".fits"])