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| # | |
| # 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" | |
| class FitsImageFile(ImageFile.ImageFile): | |
| format = "FITS" | |
| format_description = "FITS" | |
| def _open(self): | |
| headers = {} | |
| while True: | |
| header = self.fp.read(80) | |
| if not header: | |
| msg = "Truncated FITS file" | |
| raise OSError(msg) | |
| keyword = header[:8].strip() | |
| if keyword == b"END": | |
| break | |
| value = header[8:].split(b"/")[0].strip() | |
| if value.startswith(b"="): | |
| value = value[1:].strip() | |
| if not headers and (not _accept(keyword) or value != b"T"): | |
| msg = "Not a FITS file" | |
| raise SyntaxError(msg) | |
| headers[keyword] = value | |
| naxis = int(headers[b"NAXIS"]) | |
| if naxis == 0: | |
| msg = "No image data" | |
| raise ValueError(msg) | |
| 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"]) | |