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image2pnm.py
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image2pnm.py
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#! /usr/bin/env python3
"""
# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
Convert an image in a variety of formats into a pnm file
"""
from __future__ import print_function
from __future__ import absolute_import
import sys
import os
import os.path
import tempfile
from astrometry.util.shell import shell_escape
from astrometry.util.filetype import filetype_short
import logging
fitstype = 'FITS image data'
fitsext = 'fits'
tiffext = 'tiff'
pgmcmd = 'pgmtoppm rgbi:1/1/1 %s > %s'
pgmext = 'pgm'
an_fitstopnm_ext_cmd = 'an-fitstopnm -e %i -i %%s > %%s'
imgcmds = {fitstype : (fitsext, 'an-fitstopnm -i %s > %s'),
'JPEG image data' : ('jpg', 'jpegtopnm %s > %s'),
'PNG image data' : ('png', 'pngtopnm %s > %s'),
'PNG image' : ('png', 'pngtopnm %s > %s'),
'GIF image data' : ('gif', 'giftopnm %s > %s'),
'Netpbm PPM' : ('ppm', 'ppmtoppm < %s > %s'),
'Netpbm PPM "rawbits" image data' : ('ppm', 'cp %s %s'),
'Netpbm PGM' : ('pgm', pgmcmd),
'Netpbm PGM "rawbits" image data' : ('pgm', pgmcmd),
'TIFF image data' : ('tiff', 'tifftopnm %s > %s'),
'PC bitmap' : ('bmp', 'bmptopnm %s > %s'),
# RAW is not recognized by 'file'; we have to use 'dcraw',
# but we still store this here for convenience.
'raw' : ('raw', 'dcraw -4 -c %s > %s'),
}
compcmds = {'gzip compressed data' : ('gz', 'gunzip -c %s > %s'),
"compress'd data 16 bits" : ('gz', 'gunzip -c %s > %s'),
'bzip2 compressed data' : ('bz2', 'bunzip2 -k -c %s > %s')
}
funpack_cmd = 'funpack -E %i -S %s > %s'
# command to identify a RAW image.
raw_id_cmd = 'dcraw -i %s >/dev/null 2> /dev/null'
verbose = False
def do_command(cmd):
logging.debug('Running: "%s"' % cmd)
if os.system(cmd) != 0:
print('Command failed: %s' % cmd, file=sys.stderr)
sys.exit(-1)
def get_cmd(types, cmds):
if types is None:
return None
ext=None
cmd=None
for t in types:
(ext,cmd) = cmds.get(t, (None,None))
if ext is not None:
break
return (ext,cmd)
def uncompress_file(infile, uncompressed, typeinfo=None, extension=None):
"""
infile: input filename.
uncompressed: output filename.
typeinfo: output from the 'file' command; if None we'll run 'file'.
Returns: comptype
comptype: None if the file wasn't compressed, or 'gz' or 'bz2'.
"""
if typeinfo is None:
typeinfo = filetype_short(infile)
if typeinfo is None:
logging.debug('Could not determine file type of "%s"' % infile)
return None
# print('uncompress_file: type is', typeinfo)
(ext,cmd) = get_cmd(typeinfo, compcmds)
# print('ext:', ext)
if ext is None:
# Check for fpack compressed FITS file.
if fitstype in typeinfo:
# FITS file. Check header for ZIMAGE=T
try:
import fitsio
logging.debug('Checking FITS header of', infile, 'ext',
extension, 'for ZIMAGE card (fpack compression)')
hdr = fitsio.read_header(infile, ext=extension)
if hdr.get('ZIMAGE', False):
# Compressed
cmd = (funpack_cmd % (
extension or 0,
shell_escape(infile), shell_escape(uncompressed)))
logging.debug('Fpack compressed; uncompressing with', cmd)
if os.system(cmd) == 0:
return 'fz'
except:
pass
logging.debug('File is not compressed: "%s"' % '/'.join(typeinfo))
return None
assert uncompressed != infile
logging.debug('Compressed file (type %s), dumping to: "%s"' % (ext, uncompressed))
do_command(cmd % (shell_escape(infile), shell_escape(uncompressed)))
return ext
def is_raw(fn):
rtn = os.system(raw_id_cmd % shell_escape(fn))
logging.debug('ran dcraw: return value %i' % rtn)
return os.WIFEXITED(rtn) and (os.WEXITSTATUS(rtn) == 0)
# Returns (extension, command, error)
def get_image_type(infile):
typeinfo = filetype_short(infile)
if typeinfo is None:
return (None, None, 'Could not determine file type (does the file exist?): %s' % infile)
(ext,cmd) = get_cmd(typeinfo, imgcmds)
logging.debug('ext: %s' % ext)
# "file" recognizes some RAWs as TIFF, but tifftopnm can't read them...
# run "dcraw" here if the type is TIFF.
if ext == tiffext and is_raw(infile):
(ext, cmd) = imgcmds['raw']
if ext is not None:
return (ext, cmd, None)
if ext != tiffext and is_raw(infile):
# it's a RAW image.
(ext, cmd) = imgcmds['raw']
return (ext, cmd, None)
return (None, None, 'Unknown image type "%s"' % typeinfo)
def find_program(dirs, cmd):
# pull off the executable name.
parts = cmd.split(' ', 1)
prog = parts[0]
# try the same directory - this should work for installed
# versions where image2pnm.py and an-fitstopnm are both in
# "bin".
for mydir in dirs:
# If mydir is actually a file, get its dir
if os.path.isfile(mydir):
mydir = os.path.dirname(mydir)
p = os.path.join(mydir, prog)
if os.path.exists(p):
return ' '.join([p, parts[1]])
logging.info('path', p, 'does not exist.')
return None
def image2pnm(infile, outfile, force_ppm=False, extension=None, mydir=None):
"""
infile: input filename.
outfile: output filename.
force_ppm: boolean, convert PGM to PPM so that the output is always PPM.
Returns: (type, error)
- type: (string): image type: 'jpg', 'png', 'gif', etc., or None if
image type isn't recognized.
- error: (string): error string, or None
"""
(ext, cmd, err) = get_image_type(infile)
if ext is None:
return (None, 'Image type not recognized: ' + err)
tempfiles = []
(outfile_dir, outfile_file) = os.path.split(outfile)
if force_ppm:
original_outfile = outfile
outfile_dir = os.path.dirname(outfile)
(f, outfile) = tempfile.mkstemp(suffix='.pnm',
dir=outfile_dir)
# we might rename this file later, so don't add it to the list of
# tempfiles to delete until later...
os.close(f)
logging.debug('temporary output file: %s' % outfile)
if ext == fitsext and extension:
cmd = an_fitstopnm_ext_cmd % extension
if ext == fitsext and mydir:
# an-fitstopnm: add explicit path...
cmd = find_program(mydir, cmd)
if cmd is None:
return (None, 'Couldn\'t find the program "an-fitstopnm".')
# Do the actual conversion
do_command(cmd % (shell_escape(infile), shell_escape(outfile)))
if force_ppm:
if ext == pgmext:
# Convert to PPM.
do_command(pgmcmd % (shell_escape(outfile), shell_escape(original_outfile)))
tempfiles.append(outfile)
else:
# print 'file type extension:', ext, '; renaming', outfile, 'to', original_outfile
os.rename(outfile, original_outfile)
for fn in tempfiles:
os.unlink(fn)
# Success
return (ext, None)
def convert_image(infile, outfile, uncompressed=None, force_ppm=False,
extension=None, mydir=None):
tempfiles = []
# if the caller didn't specify where to put the uncompressed file,
# create a tempfile.
if uncompressed is None:
(outfile_dir, outfile_file) = os.path.split(outfile)
(f, uncompressed) = tempfile.mkstemp('', 'uncomp', outfile_dir)
os.close(f)
tempfiles.append(uncompressed)
comp = uncompress_file(infile, uncompressed, extension=extension)
if comp:
print('compressed')
print(comp)
infile = uncompressed
if comp == 'fz':
# Funpack writes a single-HDU output file.
extension = 0
(imgtype, errstr) = image2pnm(infile, outfile, force_ppm=force_ppm,
extension=extension, mydir=mydir)
for fn in tempfiles:
os.unlink(fn)
if errstr:
logging.error('ERROR: %s' % errstr)
return -1
print(imgtype)
return 0
def main():
from optparse import OptionParser
parser = OptionParser()
parser.add_option('-i', '--infile',
dest='infile',
help='input image FILE', metavar='FILE')
parser.add_option('-u', '--uncompressed-outfile',
dest='uncompressed_outfile',
help='uncompressed temporary FILE', metavar='FILE',
default='')
parser.add_option('-o', '--outfile',
dest='outfile',
help='output pnm image FILE', metavar='FILE')
parser.add_option('-p', '--ppm',
action='store_true', dest='force_ppm',
help='convert the output to PPM')
parser.add_option('-e', '--extension',
dest='extension', type='int',
help='FITS extension to read')
parser.add_option('--mydir', help='Set directory to search for an-fitstopnm')
parser.add_option('-v', '--verbose',
action='store_true', dest='verbose',
help='be chatty')
(options, args) = parser.parse_args()
if not options.infile:
parser.error('required argument missing: infile')
if not options.outfile:
parser.error('required argument missing: outfile')
# Find the path to this executable and use it to find other Astrometry.net
# executables.
dirs = []
if options.mydir:
dirs.append(options.mydir)
if len(sys.argv):
dirs.append(os.path.dirname(sys.argv[0]))
# util/ -- useful when running from source directory
dirs.append(os.path.dirname(__file__))
print('Dirs:', dirs)
global verbose
verbose = options.verbose
logformat = '%(message)s'
if verbose:
logging.basicConfig(level=logging.DEBUG, format=logformat)
else:
logging.basicConfig(level=logging.INFO, format=logformat)
logging.raiseExceptions = False
return convert_image(options.infile, options.outfile,
uncompressed=options.uncompressed_outfile,
force_ppm=options.force_ppm,
extension=options.extension,
mydir=dirs)
if __name__ == '__main__':
sys.exit(main())