/usr/share/pyshared/fabio/tifimage.py is in python-fabio 0.0.8-1.
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#-*- coding: utf8 -*-
"""
FabIO class for dealing with TIFF images.
In facts wraps TiffIO from Armando (available in PyMca) or falls back to PIL
Authors: Jérôme Kieffer (jerome.kieffer@esrf.fr)
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
License: GPLv3+
"""
__authors__ = ["Jérôme Kieffer", "Henning O. Sorensen", "Erik Knudsen"]
__date__ = "11/07/2011"
__license__ = "GPLv3+"
__copyright__ = "ESRF, Grenoble & Risoe National Laboratory"
import time, logging, struct
logger = logging.getLogger("tifimage")
import Image
import numpy
from fabioimage import fabioimage
from TiffIO import TiffIO
PIL_TO_NUMPY = { "I;16": numpy.uint16,
"F": numpy.float32,
"1": numpy.bool,
"I": numpy.int32,
"L": numpy.uint8,
}
LITTLE_ENDIAN = 1234
BIG_ENDIAN = 3412
TYPES = {0:'invalid', 1:'byte', 2:'ascii', 3:'short', 4:'long', 5:'rational', 6:'sbyte', 7:'undefined', 8:'sshort', 9:'slong', 10:'srational', 11:'float', 12:'double'}
TYPESIZES = {0:0, 1:1, 2:1, 3:2, 4:4, 5:8, 6:1, 7:1, 8:2, 9:4, 10:8, 11:4, 12:8}
baseline_tiff_tags = {
256:'ImageWidth',
257:'ImageLength',
296:'ResolutionUnit',
306:'DateTime',
315:'Artist',
258:'BitsPerSample',
265:'CellLength',
264:'CellWidth',
259:'Compression',
262:'PhotometricInterpretation',
296:'ResolutionUnit',
282:'XResolution',
283:'YResolution',
278:'RowsPerStrip',
273:'StripOffset',
279:'StripByteCounts',
270:'ImageDescription',
271:'Make',
272:'Model',
320:'ColorMap',
305:'Software',
339:'SampleFormat',
33432:'Copyright'
}
class tifimage(fabioimage):
"""
Images in TIF format
Wraps TiffIO
"""
_need_a_seek_to_read = True
def __init__(self, *args, **kwds):
""" Tifimage constructor adds an nbits member attribute """
self.nbits = None
fabioimage.__init__(self, *args, **kwds)
self.lib = None
def _readheader(self, infile):
"""
Try to read Tiff images header...
"""
# try:
# self.header = { "filename" : infile.name }
# except AttributeError:
# self.header = {}
#
# t = Tiff_header(infile.read())
# self.header = t.header
# try:
# self.dim1 = int(self.header['ImageWidth'])
# self.dim2 = int(self.header['ImageLength'])
# except (KeyError):
# logger.warning("image dimensions could not be determined from header tags, trying to go on anyway")
# read the first 32 bytes to determine size
header = numpy.fromstring(infile.read(64), numpy.uint16)
self.dim1 = int(header[9])
self.dim2 = int(header[15])
# nbits is not a fabioimage attribute...
self.nbits = int(header[21]) # number of bits
def read(self, fname):
"""
Wrapper for TiffIO.
"""
infile = self._open(fname, "rb")
self._readheader(infile)
infile.seek(0)
tiffIO = TiffIO(infile)
if tiffIO.getNumberOfImages() > 0:
try:
self.data = tiffIO.getImage(0)
except IOError:
logger.warning("Unable to read %s with TiffIO" % fname)
else:
infile.seek(0)
self.lib = "TiffIO"
self.header = tiffIO.getInfo(0)
self.dim2, self.dim1 = self.data.shape
if self.lib is None:
try:
infile.seek(0)
self.pilimage = Image.open(infile)
except:
logger.error("Error in opening %s with PIL" % fname)
self.lib = None
infile.seek(0)
else:
self.dim1, self.dim2 = self.pilimage.size
if self.pilimage.mode in PIL_TO_NUMPY:
self.data = numpy.fromstring(self.pilimage.tostring(), PIL_TO_NUMPY[self.pilimage.mode])
else: #probably RGB or RGBA images: rely on PIL to convert it to greyscale float.
self.data = numpy.fromstring(self.pilimage.convert("F").tostring(), numpy.float32)
self.data.shape = (self.dim2, self.dim1)
self.bpp = len(numpy.zeros(1, dtype=self.data.dtype).tostring())
self.bytecode = self.data.dtype.name
self.resetvals()
return self
def write(self, fname):
"""
Overrides the fabioimage.write method and provides a simple TIFF image writer.
@param fname: name of the file to save the image to
@tag_type fname: string or unicode (file?)...
"""
tiffIO = TiffIO(fname, mode="w")
tiffIO.writeImage(self.data, info=self.header, software="fabio.tifimage", date=time.ctime())
#define a couple of helper classes here:
class Tiff_header(object):
def __init__(self, string):
if string[:4] == "II\x2a\x00":
self.byteorder = LITTLE_ENDIAN
elif string[:4] == 'MM\x00\x2a':
self.byteorder = BIG_ENDIAN
else:
logger.warning("Warning: This does not appear to be a tiff file")
#the next two bytes contains the offset of the oth IFD
offset_first_ifd = struct.unpack_from("h", string[4:])[0]
self.ifd = [Image_File_Directory()]
offset_next = self.ifd[0].unpack(string, offset_first_ifd)
while (offset_next != 0):
self.ifd.append(Image_File_Directory())
offset_next = self.ifd[-1].unpack(string, offset_next)
self.header = {}
#read the values of the header items into a dictionary
for entry in self.ifd[0].entries:
if entry.tag in baseline_tiff_tags.keys():
self.header[baseline_tiff_tags[entry.tag]] = entry.val
else:
self.header[entry.tag] = entry.val
class Image_File_Directory(object):
def __init__(self, instring=None, offset= -1):
self.entries = []
self.offset = offset
self.count = None
def unpack(self, instring, offset= -1):
if (offset == -1): offset = self.offset
strInput = instring[offset:]
self.count = struct.unpack_from("H", strInput[:2])[0]
#0th IFD contains count-1 entries (count includes the adress of the next IFD)
for i in range(self.count - 1):
e = Image_File_Directory_entry().unpack(strInput[2 + 12 * (i + 1):])
if (e != None):
self.entries.append(e)
#extract data associated with tags
for e in self.entries:
if (e.val == None):
e.extract_data(instring)
#do we have some more ifds in this file
offset_next = struct.unpack_from("L", instring[offset + 2 + self.count * 12:])[0]
return offset_next
class Image_File_Directory_entry(object):
def __init__(self, tag=0, tag_type=0, count=0, offset=0):
self.tag = tag
self.tag_type = tag_type
self.count = count
self.val_offset = offset
self.val = None
def unpack(self, strInput):
idfentry = strInput[:12]
################################################################################
# # TOFIX: How is it possible that HHL (2+2+4 bytes has a size of )
################################################################################
(tag, tag_type, count) = struct.unpack_from("HHL", idfentry)
self.tag = tag
self.count = count
self.tag_type = tag_type
self.val = None
if (count <= 0):
logger.warning("Tag # %s has an invalid count: %s. Tag is ignored" % (tag, count))
return
if(count * TYPESIZES[tag_type] <= 4):
self.val_offset = 8
self.extract_data(idfentry)
self.val_offset = None
else:
self.val_offset = struct.unpack_from("L", idfentry[8:])[0]
return self
def extract_data(self, full_string):
tag_type = self.tag_type
if (TYPES[tag_type] == 'byte'):
self.val = struct.unpack_from("B", full_string[self.val_offset:])[0]
elif (TYPES[tag_type] == 'short'):
self.val = struct.unpack_from("H", full_string[self.val_offset:])[0]
elif (TYPES[tag_type] == 'long'):
self.val = struct.unpack_from("L", full_string[self.val_offset:])[0]
elif (TYPES[tag_type] == 'sbyte'):
self.val = struct.unpack_from("b", full_string[self.val_offset:])[0]
elif (TYPES[tag_type] == 'sshort'):
self.val = struct.unpack_from("h", full_string[self.val_offset:])[0]
elif (TYPES[tag_type] == 'slong'):
self.val = struct.unpack_from("l", full_string[self.val_offset:])[0]
elif (TYPES[tag_type] == 'ascii'):
self.val = full_string[self.val_offset:self.val_offset + max(self.count, 4)]
elif (TYPES[tag_type] == 'rational'):
if self.val_offset != None:
(num, den) = struct.unpack_from("LL", full_string[self.val_offset:])
print self.val_offset
self.val = float(num) / den
elif (TYPES[tag_type] == 'srational'):
if self.val_offset != None:
(num, den) = struct.unpack_from("ll", full_string[self.val_offset:])
self.val = float(num) / den,
elif (TYPES[tag_type] == 'float'):
self.val = struct.unpack_from("f", full_string[self.val_offset:])[0]
elif (TYPES[tag_type] == 'double'):
if self.val_offset != None:
self.val = struct.unpack_from("d", full_string[self.val_offset:])[0]
else:
logger.warning("unrecognized type of strInputentry self: %s tag: %s type: %s TYPE: %s" % (self, baseline_tiff_tags[self.tag], self.tag_type, TYPES[tag_type]))
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