/usr/share/pyshared/fabio/pnmimage.py is in python-fabio 0.0.8-1.
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 | ## Automatically adapted for numpy.oldnumeric Oct 05, 2007 by alter_code1.py
#!/usr/bin/env python
"""
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
"""
import numpy, 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, verbose=0):
self.header = {}
self.resetvals()
infile = self._open(fname)
self._readheader(infile)
#read the image data
try:
#let the Subformat header field pick the right decoder
self.data = eval('self.' + self.header['SUBFORMAT'] + 'dec(infile,self.bytecode)')
except ValueError:
raise IOError
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
def P4dec(self, buf, bytecode):
logger.warning('single bit (pbm) images are not supported - yet')
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
def P3dec(self, buf, bytecode):
#decode (plain-ppm) rgb image
pass
def P6dec(self, buf, bytecode):
#decode (ppm) rgb image
pass
def P7dec(self, buf, bytecode):
#decode pam images, i.e. call one of the other decoders
pass
def write(self, filename):
logger.warning('write pnm images is not implemented yet.')
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