/usr/share/pyshared/fabio/pnmimage.py is in python-fabio 0.1.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | #!/usr/bin/env python
#coding: utf8
"""
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
"""
# Get ready for python3:
from __future__ import with_statement, print_function
import numpy
import logging
logger = logging.getLogger("pnmimage")
from .fabioimage import fabioimage
SUBFORMATS = ['P1', 'P2', 'P3', 'P4', 'P5', 'P6', 'P7']
HEADERITEMS = ['SUBFORMAT', 'DIMENSIONS', 'MAXVAL']
P7HEADERITEMS = ['WIDTH', 'HEIGHT', 'DEPTH', 'MAXVAL', 'TUPLTYPE', 'ENDHDR']
class pnmimage(fabioimage):
def __init__(self, *arg, **kwargs):
fabioimage.__init__(self, *arg, **kwargs)
fun = getattr(fabioimage, '__init__', lambda x: None)
fun(self)
self.data = None
self.header = {'Subformat':'P5'}
self.dim1 = self.dim2 = 0
self.m = self.maxval = self.stddev = self.minval = None
self.header_keys = self.header.keys()
self.bytecode = None
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)
self.header_keys = ['SUBFORMAT', 'DIMENSIONS', 'MAXVAL']
l = f.readline().strip()
if l not in SUBFORMATS:
raise IOError, ('unknown subformat of pnm: %s' % l)
else:
self.header['SUBFORMAT'] = l
if self.header['SUBFORMAT'] == 'P7':
self.header_keys = P7HEADERITEMS
#this one has a special header
while '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:
self.header_keys = HEADERITEMS
for k in self.header_keys[1:]:
l = f.readline()
while(l[0] == '#'): l = f.readline()
self.header[k] = l.strip()
#set the dimensions
dims = (self.header['DIMENSIONS'].split())
self.dim1, self.dim2 = int(dims[0]), int(dims[1])
#figure out how many bytes are used to store the data
#case construct here!
m = int(self.header['MAXVAL'])
if m < 256:
self.bytecode = numpy.uint8
elif m < 65536:
self.bytecode = numpy.uint16
elif m < 2147483648L:
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.resetvals()
infile = self._open(fname)
self._readheader(infile)
#read the image data
decoder_name = "%sdec" % self.header['SUBFORMAT']
if decoder_name in dir(pnmimage):
decoder = getattr(pnmimage, decoder_name)
self.data = decoder(infile, self.bytecode)
else:
raise IOError("No decoder named %s for file %s" % (decoder_name, fname))
self.resetvals()
return self
def P1dec(self, buf, bytecode):
data = numpy.zeros((self.dim2, self.dim1))
i = 0
for l in buf.readlines():
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
@staticmethod
def P4dec(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.readlines():
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.reshape(numpy.fromstring(l, bytecode), [self.dim2, self.dim1]).byteswap()
except ValueError:
raise IOError, 'Size spec in pnm-header does not match size of image data field'
return data
@staticmethod
def P3dec(buf, bytecode):
err = '(plain-ppm) RGB images are not supported - yet'
logger.error(err)
raise NotImplementedError(err)
@staticmethod
def P6dec(buf, bytecode):
err = '(ppm) RGB images are not supported - yet'
logger.error(err)
raise NotImplementedError(err)
@staticmethod
def P7dec(buf, bytecode):
err = '(pam) images are not supported - yet'
logger.error(err)
raise NotImplementedError(err)
def write(self, filename):
raise NotImplementedError('write pnm images is not implemented yet.')
@staticmethod
def checkData(data=None):
if data is None:
return None
else:
return data.astype(int)
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