/usr/lib/python2.7/dist-packages/fabio/pnmimage.py is in python-fabio 0.3.0+dfsg-1build1.
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#
# Project: X-ray image reader
# https://github.com/kif/fabio
#
#
# Copyright (C) European Synchrotron Radiation Facility, Grenoble, France
#
# Principal author: Jérôme Kieffer (Jerome.Kieffer@ESRF.eu)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""
Authors: Henning O. Sorensen & Erik Knudsen
Center for Fundamental Research: Metal Structures in Four Dimensions
Risoe National Laboratory
Frederiksborgvej 399
DK-4000 Roskilde
email:henning.sorensen@risoe.dk
* Jérôme Kieffer:
European Synchrotron Radiation Facility;
Grenoble (France)
License: GPLv3+
"""
# Get ready for python3:
from __future__ import absolute_import, print_function, with_statement, division
__authors__ = ["Jérôme Kieffer", "Henning O. Sorensen", "Erik Knudsen"]
__date__ = "05/11/2015"
__license__ = "GPLv3+"
__copyright__ = "ESRF, Grenoble & Risoe National Laboratory"
__status__ = "stable"
import numpy
import logging
logger = logging.getLogger("pnmimage")
from .fabioimage import FabioImage
from .fabioutils import six
SUBFORMATS = [six.b(i) for i in ('P1', 'P2', 'P3', 'P4', 'P5', 'P6', 'P7')]
HEADERITEMS = [six.b(i) for i in ('SUBFORMAT', 'WIDTH', 'HEIGHT', 'MAXVAL')]
P7HEADERITEMS = [six.b(i) for i in ('WIDTH', 'HEIGHT', 'DEPTH', 'MAXVAL', 'TUPLTYPE', 'ENDHDR')]
class PnmImage(FabioImage):
def __init__(self, *arg, **kwargs):
FabioImage.__init__(self, *arg, **kwargs)
self.header['Subformat'] = 'P5'
def _readheader(self, f):
# pnm images have a 3-line header but ignore lines starting with '#'
# 1st line contains the pnm image sub format
# 2nd line contains the image pixel dimension
# 3rd line contains the maximum pixel value (at least for grayscale - check this)
l = f.readline().strip()
if l not in SUBFORMATS:
raise IOError('unknown subformat of pnm: %s' % l)
else:
self.header[six.b('SUBFORMAT')] = l
if self.header[six.b('SUBFORMAT')] == 'P7':
# this one has a special header
while six.b('ENDHDR') not in l:
l = f.readline()
while(l[0] == '#'): l = f.readline()
s = l.lsplit(' ', 1)
if s[0] not in P7HEADERITEMS:
raise IOError('Illegal pam (netpnm p7) headeritem %s' % s[0])
self.header[s[0]] = s[1]
else:
values = list(l.split())
while len(values) < len(HEADERITEMS):
l = f.readline()
while l[0] == '#':
l = f.readline()
values += l.split()
for k, v in zip(HEADERITEMS, values):
self.header[k] = v.strip()
# set the dimensions
self.dim1 = int(self.header[six.b("WIDTH")])
self.dim2 = int(self.header[six.b("HEIGHT")])
# figure out how many bytes are used to store the data
# case construct here!
m = int(self.header[six.b('MAXVAL')])
if m < 256:
self.bytecode = numpy.uint8
elif m < 65536:
self.bytecode = numpy.uint16
elif m < 2147483648:
self.bytecode = numpy.uint32
logger.warning('32-bit pixels are not really supported by the netpgm standard')
else:
raise IOError('could not figure out what kind of pixels you have')
def read(self, fname, frame=None):
"""
try to read PNM images
@param fname: name of the file
@param frame: not relevant here! PNM is always single framed
"""
self.header = self.check_header()
self.resetvals()
infile = self._open(fname)
self._readheader(infile)
# read the image data
if six.PY3:
format = str(self.header[six.b('SUBFORMAT')], encoding="latin-1")
else:
format = self.header[six.b('SUBFORMAT')]
decoder_name = "%sdec" % format
if decoder_name in dir(PnmImage):
decoder = getattr(PnmImage, decoder_name)
self.data = decoder(self, infile, self.bytecode)
else:
raise IOError("No decoder named %s for file %s" % (decoder_name, fname))
self.resetvals()
return self
def write(self, fname):
"""
try to write image. For now, limited to
@param fname: name of the file
"""
self.header[six.b("SUBFORMAT")] = "P5"
self.header[six.b("WIDTH")] = self.dim1
self.header[six.b("HEIGHT")] = self.dim2
self.header[six.b("MAXVAL")] = self.data.max()
header = six.b(" ".join([str(self.header[key]) for key in HEADERITEMS[1:]]))
with open(fname, "wb") as fobj:
fobj.write(six.b("P5 \n"))
fobj.write(header)
fobj.write(six.b(" \n"))
if numpy.little_endian:
fobj.write(self.data.byteswap().tostring())
else:
fobj.write(self.data.tostring())
def P1dec(self, buf, bytecode):
data = numpy.zeros((self.dim2, self.dim1))
i = 0
for l in buf:
try:
data[i, :] = numpy.array(l.split()).astype(bytecode)
except ValueError:
raise IOError('Size spec in pnm-header does not match size of image data field')
return data
def P4dec(self, buf, bytecode):
err = 'single bit (pbm) images are not supported - yet'
logger.error(err)
raise NotImplementedError(err)
def P2dec(self, buf, bytecode):
data = numpy.zeros((self.dim2, self.dim1))
i = 0
for l in buf:
try:
data[i, :] = numpy.array(l.split()).astype(bytecode)
except ValueError:
raise IOError('Size spec in pnm-header does not match size of image data field')
return data
def P5dec(self, buf, bytecode):
l = buf.read()
try:
data = numpy.fromstring(l, bytecode)
except ValueError:
raise IOError('Size spec in pnm-header does not match size of image data field')
data.shape = self.dim2, self.dim1
if numpy.little_endian:
data.byteswap(True)
return data
def P3dec(self, buf, bytecode):
err = '(plain-ppm) RGB images are not supported - yet'
logger.error(err)
raise NotImplementedError(err)
def P6dec(self, buf, bytecode):
err = '(ppm) RGB images are not supported - yet'
logger.error(err)
raise NotImplementedError(err)
def P7dec(self, buf, bytecode):
err = '(pam) images are not supported - yet'
logger.error(err)
raise NotImplementedError(err)
@staticmethod
def check_data(data=None):
if data is None:
return None
else:
data = data.clip(0, 65535)
if data.max() < 256:
return data.astype(numpy.uint8)
else:
return data.astype(numpy.uint16)
pnmimage = PnmImage
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