#
|
# The Python Imaging Library.
|
# $Id$
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#
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# TIFF file handling
|
#
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# TIFF is a flexible, if somewhat aged, image file format originally
|
# defined by Aldus. Although TIFF supports a wide variety of pixel
|
# layouts and compression methods, the name doesn't really stand for
|
# "thousands of incompatible file formats," it just feels that way.
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#
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# To read TIFF data from a stream, the stream must be seekable. For
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# progressive decoding, make sure to use TIFF files where the tag
|
# directory is placed first in the file.
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#
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# History:
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# 1995-09-01 fl Created
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# 1996-05-04 fl Handle JPEGTABLES tag
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# 1996-05-18 fl Fixed COLORMAP support
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# 1997-01-05 fl Fixed PREDICTOR support
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# 1997-08-27 fl Added support for rational tags (from Perry Stoll)
|
# 1998-01-10 fl Fixed seek/tell (from Jan Blom)
|
# 1998-07-15 fl Use private names for internal variables
|
# 1999-06-13 fl Rewritten for PIL 1.0 (1.0)
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# 2000-10-11 fl Additional fixes for Python 2.0 (1.1)
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# 2001-04-17 fl Fixed rewind support (seek to frame 0) (1.2)
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# 2001-05-12 fl Added write support for more tags (from Greg Couch) (1.3)
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# 2001-12-18 fl Added workaround for broken Matrox library
|
# 2002-01-18 fl Don't mess up if photometric tag is missing (D. Alan Stewart)
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# 2003-05-19 fl Check FILLORDER tag
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# 2003-09-26 fl Added RGBa support
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# 2004-02-24 fl Added DPI support; fixed rational write support
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# 2005-02-07 fl Added workaround for broken Corel Draw 10 files
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# 2006-01-09 fl Added support for float/double tags (from Russell Nelson)
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#
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# Copyright (c) 1997-2006 by Secret Labs AB. All rights reserved.
|
# Copyright (c) 1995-1997 by Fredrik Lundh
|
#
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# See the README file for information on usage and redistribution.
|
#
|
|
__version__ = "1.3.5"
|
|
import Image, ImageFile
|
import ImagePalette
|
|
import array, string, sys
|
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II = "II" # little-endian (intel-style)
|
MM = "MM" # big-endian (motorola-style)
|
|
try:
|
if sys.byteorder == "little":
|
native_prefix = II
|
else:
|
native_prefix = MM
|
except AttributeError:
|
if ord(array.array("i",[1]).tostring()[0]):
|
native_prefix = II
|
else:
|
native_prefix = MM
|
|
#
|
# --------------------------------------------------------------------
|
# Read TIFF files
|
|
def il16(c,o=0):
|
return ord(c[o]) + (ord(c[o+1])<<8)
|
def il32(c,o=0):
|
return ord(c[o]) + (ord(c[o+1])<<8) + (ord(c[o+2])<<16) + (ord(c[o+3])<<24)
|
def ol16(i):
|
return chr(i&255) + chr(i>>8&255)
|
def ol32(i):
|
return chr(i&255) + chr(i>>8&255) + chr(i>>16&255) + chr(i>>24&255)
|
|
def ib16(c,o=0):
|
return ord(c[o+1]) + (ord(c[o])<<8)
|
def ib32(c,o=0):
|
return ord(c[o+3]) + (ord(c[o+2])<<8) + (ord(c[o+1])<<16) + (ord(c[o])<<24)
|
def ob16(i):
|
return chr(i>>8&255) + chr(i&255)
|
def ob32(i):
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return chr(i>>24&255) + chr(i>>16&255) + chr(i>>8&255) + chr(i&255)
|
|
# a few tag names, just to make the code below a bit more readable
|
IMAGEWIDTH = 256
|
IMAGELENGTH = 257
|
BITSPERSAMPLE = 258
|
COMPRESSION = 259
|
PHOTOMETRIC_INTERPRETATION = 262
|
FILLORDER = 266
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IMAGEDESCRIPTION = 270
|
STRIPOFFSETS = 273
|
SAMPLESPERPIXEL = 277
|
ROWSPERSTRIP = 278
|
STRIPBYTECOUNTS = 279
|
X_RESOLUTION = 282
|
Y_RESOLUTION = 283
|
PLANAR_CONFIGURATION = 284
|
RESOLUTION_UNIT = 296
|
SOFTWARE = 305
|
DATE_TIME = 306
|
ARTIST = 315
|
PREDICTOR = 317
|
COLORMAP = 320
|
TILEOFFSETS = 324
|
EXTRASAMPLES = 338
|
SAMPLEFORMAT = 339
|
JPEGTABLES = 347
|
COPYRIGHT = 33432
|
IPTC_NAA_CHUNK = 33723 # newsphoto properties
|
PHOTOSHOP_CHUNK = 34377 # photoshop properties
|
ICCPROFILE = 34675
|
EXIFIFD = 34665
|
XMP = 700
|
|
COMPRESSION_INFO = {
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# Compression => pil compression name
|
1: "raw",
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2: "tiff_ccitt",
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3: "group3",
|
4: "group4",
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5: "tiff_lzw",
|
6: "tiff_jpeg", # obsolete
|
7: "jpeg",
|
32771: "tiff_raw_16", # 16-bit padding
|
32773: "packbits"
|
}
|
|
OPEN_INFO = {
|
# (ByteOrder, PhotoInterpretation, SampleFormat, FillOrder, BitsPerSample,
|
# ExtraSamples) => mode, rawmode
|
(II, 0, 1, 1, (1,), ()): ("1", "1;I"),
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(II, 0, 1, 2, (1,), ()): ("1", "1;IR"),
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(II, 0, 1, 1, (8,), ()): ("L", "L;I"),
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(II, 0, 1, 2, (8,), ()): ("L", "L;IR"),
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(II, 1, 1, 1, (1,), ()): ("1", "1"),
|
(II, 1, 1, 2, (1,), ()): ("1", "1;R"),
|
(II, 1, 1, 1, (8,), ()): ("L", "L"),
|
(II, 1, 1, 1, (8,8), (2,)): ("LA", "LA"),
|
(II, 1, 1, 2, (8,), ()): ("L", "L;R"),
|
(II, 1, 1, 1, (16,), ()): ("I;16", "I;16"),
|
(II, 1, 2, 1, (16,), ()): ("I;16S", "I;16S"),
|
(II, 1, 2, 1, (32,), ()): ("I", "I;32S"),
|
(II, 1, 3, 1, (32,), ()): ("F", "F;32F"),
|
(II, 2, 1, 1, (8,8,8), ()): ("RGB", "RGB"),
|
(II, 2, 1, 2, (8,8,8), ()): ("RGB", "RGB;R"),
|
(II, 2, 1, 1, (8,8,8,8), (0,)): ("RGBX", "RGBX"),
|
(II, 2, 1, 1, (8,8,8,8), (1,)): ("RGBA", "RGBa"),
|
(II, 2, 1, 1, (8,8,8,8), (2,)): ("RGBA", "RGBA"),
|
(II, 2, 1, 1, (8,8,8,8), (999,)): ("RGBA", "RGBA"), # corel draw 10
|
(II, 3, 1, 1, (1,), ()): ("P", "P;1"),
|
(II, 3, 1, 2, (1,), ()): ("P", "P;1R"),
|
(II, 3, 1, 1, (2,), ()): ("P", "P;2"),
|
(II, 3, 1, 2, (2,), ()): ("P", "P;2R"),
|
(II, 3, 1, 1, (4,), ()): ("P", "P;4"),
|
(II, 3, 1, 2, (4,), ()): ("P", "P;4R"),
|
(II, 3, 1, 1, (8,), ()): ("P", "P"),
|
(II, 3, 1, 1, (8,8), (2,)): ("PA", "PA"),
|
(II, 3, 1, 2, (8,), ()): ("P", "P;R"),
|
(II, 5, 1, 1, (8,8,8,8), ()): ("CMYK", "CMYK"),
|
(II, 6, 1, 1, (8,8,8), ()): ("YCbCr", "YCbCr"),
|
(II, 8, 1, 1, (8,8,8), ()): ("LAB", "LAB"),
|
|
(MM, 0, 1, 1, (1,), ()): ("1", "1;I"),
|
(MM, 0, 1, 2, (1,), ()): ("1", "1;IR"),
|
(MM, 0, 1, 1, (8,), ()): ("L", "L;I"),
|
(MM, 0, 1, 2, (8,), ()): ("L", "L;IR"),
|
(MM, 1, 1, 1, (1,), ()): ("1", "1"),
|
(MM, 1, 1, 2, (1,), ()): ("1", "1;R"),
|
(MM, 1, 1, 1, (8,), ()): ("L", "L"),
|
(MM, 1, 1, 1, (8,8), (2,)): ("LA", "LA"),
|
(MM, 1, 1, 2, (8,), ()): ("L", "L;R"),
|
(MM, 1, 1, 1, (16,), ()): ("I;16B", "I;16B"),
|
(MM, 1, 2, 1, (16,), ()): ("I;16BS", "I;16BS"),
|
(MM, 1, 2, 1, (32,), ()): ("I;32BS", "I;32BS"),
|
(MM, 1, 3, 1, (32,), ()): ("F;32BF", "F;32BF"),
|
(MM, 2, 1, 1, (8,8,8), ()): ("RGB", "RGB"),
|
(MM, 2, 1, 2, (8,8,8), ()): ("RGB", "RGB;R"),
|
(MM, 2, 1, 1, (8,8,8,8), (0,)): ("RGBX", "RGBX"),
|
(MM, 2, 1, 1, (8,8,8,8), (1,)): ("RGBA", "RGBa"),
|
(MM, 2, 1, 1, (8,8,8,8), (2,)): ("RGBA", "RGBA"),
|
(MM, 2, 1, 1, (8,8,8,8), (999,)): ("RGBA", "RGBA"), # corel draw 10
|
(MM, 3, 1, 1, (1,), ()): ("P", "P;1"),
|
(MM, 3, 1, 2, (1,), ()): ("P", "P;1R"),
|
(MM, 3, 1, 1, (2,), ()): ("P", "P;2"),
|
(MM, 3, 1, 2, (2,), ()): ("P", "P;2R"),
|
(MM, 3, 1, 1, (4,), ()): ("P", "P;4"),
|
(MM, 3, 1, 2, (4,), ()): ("P", "P;4R"),
|
(MM, 3, 1, 1, (8,), ()): ("P", "P"),
|
(MM, 3, 1, 1, (8,8), (2,)): ("PA", "PA"),
|
(MM, 3, 1, 2, (8,), ()): ("P", "P;R"),
|
(MM, 5, 1, 1, (8,8,8,8), ()): ("CMYK", "CMYK"),
|
(MM, 6, 1, 1, (8,8,8), ()): ("YCbCr", "YCbCr"),
|
(MM, 8, 1, 1, (8,8,8), ()): ("LAB", "LAB"),
|
|
}
|
|
PREFIXES = ["MM\000\052", "II\052\000", "II\xBC\000"]
|
|
def _accept(prefix):
|
return prefix[:4] in PREFIXES
|
|
##
|
# Wrapper for TIFF IFDs.
|
|
class ImageFileDirectory:
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|
# represents a TIFF tag directory. to speed things up,
|
# we don't decode tags unless they're asked for.
|
|
def __init__(self, prefix):
|
self.prefix = prefix[:2]
|
if self.prefix == MM:
|
self.i16, self.i32 = ib16, ib32
|
self.o16, self.o32 = ob16, ob32
|
elif self.prefix == II:
|
self.i16, self.i32 = il16, il32
|
self.o16, self.o32 = ol16, ol32
|
else:
|
raise SyntaxError("not a TIFF IFD")
|
self.reset()
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|
def reset(self):
|
self.tags = {}
|
self.tagdata = {}
|
self.tagtype = {} # added 2008-06-05 by Florian Hoech
|
self.next = None
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|
# dictionary API (sort of)
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|
def keys(self):
|
return self.tagdata.keys() + self.tags.keys()
|
|
def items(self):
|
items = self.tags.items()
|
for tag in self.tagdata.keys():
|
items.append((tag, self[tag]))
|
return items
|
|
def __len__(self):
|
return len(self.tagdata) + len(self.tags)
|
|
def __getitem__(self, tag):
|
try:
|
return self.tags[tag]
|
except KeyError:
|
type, data = self.tagdata[tag] # unpack on the fly
|
size, handler = self.load_dispatch[type]
|
self.tags[tag] = data = handler(self, data)
|
del self.tagdata[tag]
|
return data
|
|
def get(self, tag, default=None):
|
try:
|
return self[tag]
|
except KeyError:
|
return default
|
|
def getscalar(self, tag, default=None):
|
try:
|
value = self[tag]
|
if len(value) != 1:
|
if tag == SAMPLEFORMAT:
|
# work around broken (?) matrox library
|
# (from Ted Wright, via Bob Klimek)
|
raise KeyError # use default
|
raise ValueError, "not a scalar"
|
return value[0]
|
except KeyError:
|
if default is None:
|
raise
|
return default
|
|
def has_key(self, tag):
|
return self.tags.has_key(tag) or self.tagdata.has_key(tag)
|
|
def __setitem__(self, tag, value):
|
if type(value) is not type(()):
|
value = (value,)
|
self.tags[tag] = value
|
|
# load primitives
|
|
load_dispatch = {}
|
|
def load_byte(self, data):
|
l = []
|
for i in range(len(data)):
|
l.append(ord(data[i]))
|
return tuple(l)
|
load_dispatch[1] = (1, load_byte)
|
|
def load_string(self, data):
|
if data[-1:] == '\0':
|
data = data[:-1]
|
return data
|
load_dispatch[2] = (1, load_string)
|
|
def load_short(self, data):
|
l = []
|
for i in range(0, len(data), 2):
|
l.append(self.i16(data, i))
|
return tuple(l)
|
load_dispatch[3] = (2, load_short)
|
|
def load_long(self, data):
|
l = []
|
for i in range(0, len(data), 4):
|
l.append(self.i32(data, i))
|
return tuple(l)
|
load_dispatch[4] = (4, load_long)
|
|
def load_rational(self, data):
|
l = []
|
for i in range(0, len(data), 8):
|
l.append((self.i32(data, i), self.i32(data, i+4)))
|
return tuple(l)
|
load_dispatch[5] = (8, load_rational)
|
|
def load_float(self, data):
|
a = array.array("f", data)
|
if self.prefix != native_prefix:
|
a.byteswap()
|
return tuple(a)
|
load_dispatch[11] = (4, load_float)
|
|
def load_double(self, data):
|
a = array.array("d", data)
|
if self.prefix != native_prefix:
|
a.byteswap()
|
return tuple(a)
|
load_dispatch[12] = (8, load_double)
|
|
def load_undefined(self, data):
|
# Untyped data
|
return data
|
load_dispatch[7] = (1, load_undefined)
|
|
def load(self, fp):
|
# load tag dictionary
|
|
self.reset()
|
|
i16 = self.i16
|
i32 = self.i32
|
|
for i in range(i16(fp.read(2))):
|
|
ifd = fp.read(12)
|
|
tag, typ = i16(ifd), i16(ifd, 2)
|
|
if Image.DEBUG:
|
import TiffTags
|
tagname = TiffTags.TAGS.get(tag, "unknown")
|
typname = TiffTags.TYPES.get(typ, "unknown")
|
print "tag: %s (%d)" % (tagname, tag),
|
print "- type: %s (%d)" % (typname, typ),
|
|
try:
|
dispatch = self.load_dispatch[typ]
|
except KeyError:
|
if Image.DEBUG:
|
print "- unsupported type", typ
|
continue # ignore unsupported type
|
|
size, handler = dispatch
|
|
size = size * i32(ifd, 4)
|
|
# Get and expand tag value
|
if size > 4:
|
here = fp.tell()
|
fp.seek(i32(ifd, 8))
|
data = ImageFile._safe_read(fp, size)
|
fp.seek(here)
|
else:
|
data = ifd[8:8+size]
|
|
if len(data) != size:
|
raise IOError, "not enough data"
|
|
self.tagdata[tag] = typ, data
|
self.tagtype[tag] = typ
|
|
if Image.DEBUG:
|
if tag in (COLORMAP, IPTC_NAA_CHUNK, PHOTOSHOP_CHUNK, ICCPROFILE, XMP):
|
print "- value: <table: %d bytes>" % size
|
else:
|
print "- value:", self[tag]
|
|
self.next = i32(fp.read(4))
|
|
# save primitives
|
|
def save(self, fp):
|
|
o16 = self.o16
|
o32 = self.o32
|
|
fp.write(o16(len(self.tags)))
|
|
# always write in ascending tag order
|
tags = self.tags.items()
|
tags.sort()
|
|
directory = []
|
append = directory.append
|
|
offset = fp.tell() + len(self.tags) * 12 + 4
|
|
stripoffsets = None
|
|
# pass 1: convert tags to binary format
|
for tag, value in tags:
|
|
typ = None
|
|
if self.tagtype.has_key(tag):
|
typ = self.tagtype[tag]
|
|
if typ == 1:
|
# byte data
|
data = value = string.join(map(chr, value), "")
|
elif typ == 7:
|
# untyped data
|
data = value = string.join(value, "")
|
elif type(value[0]) is type(""):
|
# string data
|
typ = 2
|
data = value = string.join(value, "\0") + "\0"
|
else:
|
# integer data
|
if tag == STRIPOFFSETS:
|
stripoffsets = len(directory)
|
typ = 4 # to avoid catch-22
|
elif tag in (X_RESOLUTION, Y_RESOLUTION):
|
# identify rational data fields
|
typ = 5
|
elif not typ:
|
typ = 3
|
for v in value:
|
if v >= 65536:
|
typ = 4
|
if typ == 3:
|
data = string.join(map(o16, value), "")
|
else:
|
data = string.join(map(o32, value), "")
|
|
if Image.DEBUG:
|
import TiffTags
|
tagname = TiffTags.TAGS.get(tag, "unknown")
|
typname = TiffTags.TYPES.get(typ, "unknown")
|
print "save: %s (%d)" % (tagname, tag),
|
print "- type: %s (%d)" % (typname, typ),
|
if tag in (COLORMAP, IPTC_NAA_CHUNK, PHOTOSHOP_CHUNK, ICCPROFILE, XMP):
|
size = len(data)
|
print "- value: <table: %d bytes>" % size
|
else:
|
print "- value:", value
|
|
# figure out if data fits into the directory
|
if len(data) == 4:
|
append((tag, typ, len(value), data, ""))
|
elif len(data) < 4:
|
append((tag, typ, len(value), data + (4-len(data))*"\0", ""))
|
else:
|
count = len(value)
|
if typ == 5:
|
count = count / 2 # adjust for rational data field
|
append((tag, typ, count, o32(offset), data))
|
offset = offset + len(data)
|
if offset & 1:
|
offset = offset + 1 # word padding
|
|
# update strip offset data to point beyond auxiliary data
|
if stripoffsets is not None:
|
tag, typ, count, value, data = directory[stripoffsets]
|
assert not data, "multistrip support not yet implemented"
|
value = o32(self.i32(value) + offset)
|
directory[stripoffsets] = tag, typ, count, value, data
|
|
# pass 2: write directory to file
|
for tag, typ, count, value, data in directory:
|
if Image.DEBUG > 1:
|
print tag, typ, count, repr(value), repr(data)
|
fp.write(o16(tag) + o16(typ) + o32(count) + value)
|
|
# -- overwrite here for multi-page --
|
fp.write("\0\0\0\0") # end of directory
|
|
# pass 3: write auxiliary data to file
|
for tag, typ, count, value, data in directory:
|
fp.write(data)
|
if len(data) & 1:
|
fp.write("\0")
|
|
return offset
|
|
##
|
# Image plugin for TIFF files.
|
|
class TiffImageFile(ImageFile.ImageFile):
|
|
format = "TIFF"
|
format_description = "Adobe TIFF"
|
|
def _open(self):
|
"Open the first image in a TIFF file"
|
|
# Header
|
ifh = self.fp.read(8)
|
|
if ifh[:4] not in PREFIXES:
|
raise SyntaxError, "not a TIFF file"
|
|
# image file directory (tag dictionary)
|
self.tag = self.ifd = ImageFileDirectory(ifh[:2])
|
|
# setup frame pointers
|
self.__first = self.__next = self.ifd.i32(ifh, 4)
|
self.__frame = -1
|
self.__fp = self.fp
|
|
# and load the first frame
|
self._seek(0)
|
|
def seek(self, frame):
|
"Select a given frame as current image"
|
|
if frame < 0:
|
frame = 0
|
self._seek(frame)
|
|
def tell(self):
|
"Return the current frame number"
|
|
return self._tell()
|
|
def _seek(self, frame):
|
|
self.fp = self.__fp
|
if frame < self.__frame:
|
# rewind file
|
self.__frame = -1
|
self.__next = self.__first
|
while self.__frame < frame:
|
if not self.__next:
|
raise EOFError, "no more images in TIFF file"
|
self.fp.seek(self.__next)
|
self.tag.load(self.fp)
|
self.__next = self.tag.next
|
self.__frame = self.__frame + 1
|
self._setup()
|
|
def _tell(self):
|
|
return self.__frame
|
|
def _decoder(self, rawmode, layer):
|
"Setup decoder contexts"
|
|
args = None
|
if rawmode == "RGB" and self._planar_configuration == 2:
|
rawmode = rawmode[layer]
|
compression = self._compression
|
if compression == "raw":
|
args = (rawmode, 0, 1)
|
elif compression == "jpeg":
|
args = rawmode, ""
|
if self.tag.has_key(JPEGTABLES):
|
# Hack to handle abbreviated JPEG headers
|
self.tile_prefix = self.tag[JPEGTABLES]
|
elif compression == "packbits":
|
args = rawmode
|
elif compression == "tiff_lzw":
|
args = rawmode
|
if self.tag.has_key(317):
|
# Section 14: Differencing Predictor
|
self.decoderconfig = (self.tag[PREDICTOR][0],)
|
|
if self.tag.has_key(ICCPROFILE):
|
self.info['icc_profile'] = self.tag[ICCPROFILE]
|
|
return args
|
|
def _setup(self):
|
"Setup this image object based on current tags"
|
|
if self.tag.has_key(0xBC01):
|
raise IOError, "Windows Media Photo files not yet supported"
|
|
getscalar = self.tag.getscalar
|
|
# extract relevant tags
|
self._compression = COMPRESSION_INFO[getscalar(COMPRESSION, 1)]
|
self._planar_configuration = getscalar(PLANAR_CONFIGURATION, 1)
|
|
# photometric is a required tag, but not everyone is reading
|
# the specification
|
photo = getscalar(PHOTOMETRIC_INTERPRETATION, 0)
|
|
fillorder = getscalar(FILLORDER, 1)
|
|
if Image.DEBUG:
|
print "*** Summary ***"
|
print "- compression:", self._compression
|
print "- photometric_interpretation:", photo
|
print "- planar_configuration:", self._planar_configuration
|
print "- fill_order:", fillorder
|
|
# size
|
xsize = getscalar(IMAGEWIDTH)
|
ysize = getscalar(IMAGELENGTH)
|
self.size = xsize, ysize
|
|
if Image.DEBUG:
|
print "- size:", self.size
|
|
format = getscalar(SAMPLEFORMAT, 1)
|
|
# mode: check photometric interpretation and bits per pixel
|
key = (
|
self.tag.prefix, photo, format, fillorder,
|
self.tag.get(BITSPERSAMPLE, (1,)),
|
self.tag.get(EXTRASAMPLES, ())
|
)
|
if Image.DEBUG:
|
print "format key:", key
|
try:
|
self.mode, rawmode = OPEN_INFO[key]
|
except KeyError:
|
if Image.DEBUG:
|
print "- unsupported format"
|
raise SyntaxError, "unknown pixel mode"
|
|
if Image.DEBUG:
|
print "- raw mode:", rawmode
|
print "- pil mode:", self.mode
|
|
self.info["compression"] = self._compression
|
|
xres = getscalar(X_RESOLUTION, (1, 1))
|
yres = getscalar(Y_RESOLUTION, (1, 1))
|
|
if xres and yres:
|
xres = xres[0] / (xres[1] or 1)
|
yres = yres[0] / (yres[1] or 1)
|
resunit = getscalar(RESOLUTION_UNIT, 1)
|
if resunit == 2: # dots per inch
|
self.info["dpi"] = xres, yres
|
elif resunit == 3: # dots per centimeter. convert to dpi
|
self.info["dpi"] = xres * 2.54, yres * 2.54
|
else: # No absolute unit of measurement
|
self.info["resolution"] = xres, yres
|
|
# build tile descriptors
|
x = y = l = 0
|
self.tile = []
|
if self.tag.has_key(STRIPOFFSETS):
|
# striped image
|
h = getscalar(ROWSPERSTRIP, ysize)
|
w = self.size[0]
|
a = None
|
for o in self.tag[STRIPOFFSETS]:
|
if not a:
|
a = self._decoder(rawmode, l)
|
self.tile.append(
|
(self._compression,
|
(0, min(y, ysize), w, min(y+h, ysize)),
|
o, a))
|
y = y + h
|
if y >= self.size[1]:
|
x = y = 0
|
l = l + 1
|
a = None
|
elif self.tag.has_key(TILEOFFSETS):
|
# tiled image
|
w = getscalar(322)
|
h = getscalar(323)
|
a = None
|
for o in self.tag[TILEOFFSETS]:
|
if not a:
|
a = self._decoder(rawmode, l)
|
# FIXME: this doesn't work if the image size
|
# is not a multiple of the tile size...
|
self.tile.append(
|
(self._compression,
|
(x, y, x+w, y+h),
|
o, a))
|
x = x + w
|
if x >= self.size[0]:
|
x, y = 0, y + h
|
if y >= self.size[1]:
|
x = y = 0
|
l = l + 1
|
a = None
|
else:
|
if Image.DEBUG:
|
print "- unsupported data organization"
|
raise SyntaxError("unknown data organization")
|
|
# fixup palette descriptor
|
|
if self.mode == "P":
|
palette = map(lambda a: chr(a / 256), self.tag[COLORMAP])
|
self.palette = ImagePalette.raw("RGB;L", string.join(palette, ""))
|
#
|
# --------------------------------------------------------------------
|
# Write TIFF files
|
|
# little endian is default except for image modes with explict big endian byte-order
|
|
SAVE_INFO = {
|
# mode => rawmode, byteorder, photometrics, sampleformat, bitspersample, extra
|
"1": ("1", II, 1, 1, (1,), None),
|
"L": ("L", II, 1, 1, (8,), None),
|
"LA": ("LA", II, 1, 1, (8,8), 2),
|
"P": ("P", II, 3, 1, (8,), None),
|
"PA": ("PA", II, 3, 1, (8,8), 2),
|
"I": ("I;32S", II, 1, 2, (32,), None),
|
"I;16": ("I;16", II, 1, 1, (16,), None),
|
"I;16S": ("I;16S", II, 1, 2, (16,), None),
|
"F": ("F;32F", II, 1, 3, (32,), None),
|
"RGB": ("RGB", II, 2, 1, (8,8,8), None),
|
"RGBX": ("RGBX", II, 2, 1, (8,8,8,8), 0),
|
"RGBA": ("RGBA", II, 2, 1, (8,8,8,8), 2),
|
"CMYK": ("CMYK", II, 5, 1, (8,8,8,8), None),
|
"YCbCr": ("YCbCr", II, 6, 1, (8,8,8), None),
|
"LAB": ("LAB", II, 8, 1, (8,8,8), None),
|
|
"I;32BS": ("I;32BS", MM, 1, 2, (32,), None),
|
"I;16B": ("I;16B", MM, 1, 1, (16,), None),
|
"I;16BS": ("I;16BS", MM, 1, 2, (16,), None),
|
"F;32BF": ("F;32BF", MM, 1, 3, (32,), None),
|
}
|
|
def _cvt_res(value):
|
# convert value to TIFF rational number -- (numerator, denominator)
|
if type(value) in (type([]), type(())):
|
assert(len(value) % 2 == 0)
|
return value
|
if type(value) == type(1):
|
return (value, 1)
|
value = float(value)
|
return (int(value * 65536), 65536)
|
|
def _save(im, fp, filename):
|
|
try:
|
rawmode, prefix, photo, format, bits, extra = SAVE_INFO[im.mode]
|
except KeyError:
|
raise IOError, "cannot write mode %s as TIFF" % im.mode
|
|
ifd = ImageFileDirectory(prefix)
|
|
# -- multi-page -- skip TIFF header on subsequent pages
|
if fp.tell() == 0:
|
# tiff header (write via IFD to get everything right)
|
# PIL always starts the first IFD at offset 8
|
fp.write(ifd.prefix + ifd.o16(42) + ifd.o32(8))
|
|
ifd[IMAGEWIDTH] = im.size[0]
|
ifd[IMAGELENGTH] = im.size[1]
|
|
# additions written by Greg Couch, gregc@cgl.ucsf.edu
|
# inspired by image-sig posting from Kevin Cazabon, kcazabon@home.com
|
if hasattr(im, 'tag'):
|
# preserve tags from original TIFF image file
|
for key in (RESOLUTION_UNIT, X_RESOLUTION, Y_RESOLUTION):
|
if im.tag.tagdata.has_key(key):
|
ifd[key] = im.tag.tagdata.get(key)
|
# preserve some more tags from original TIFF image file
|
# -- 2008-06-06 Florian Hoech
|
ifd.tagtype = im.tag.tagtype
|
for key in (IPTC_NAA_CHUNK, PHOTOSHOP_CHUNK, XMP):
|
if im.tag.has_key(key):
|
ifd[key] = im.tag[key]
|
# preserve ICC profile (should also work when saving other formats
|
# which support profiles as TIFF) -- 2008-06-06 Florian Hoech
|
if im.info.has_key("icc_profile"):
|
ifd[ICCPROFILE] = im.info["icc_profile"]
|
if im.encoderinfo.has_key("description"):
|
ifd[IMAGEDESCRIPTION] = im.encoderinfo["description"]
|
if im.encoderinfo.has_key("resolution"):
|
ifd[X_RESOLUTION] = ifd[Y_RESOLUTION] \
|
= _cvt_res(im.encoderinfo["resolution"])
|
if im.encoderinfo.has_key("x resolution"):
|
ifd[X_RESOLUTION] = _cvt_res(im.encoderinfo["x resolution"])
|
if im.encoderinfo.has_key("y resolution"):
|
ifd[Y_RESOLUTION] = _cvt_res(im.encoderinfo["y resolution"])
|
if im.encoderinfo.has_key("resolution unit"):
|
unit = im.encoderinfo["resolution unit"]
|
if unit == "inch":
|
ifd[RESOLUTION_UNIT] = 2
|
elif unit == "cm" or unit == "centimeter":
|
ifd[RESOLUTION_UNIT] = 3
|
else:
|
ifd[RESOLUTION_UNIT] = 1
|
if im.encoderinfo.has_key("software"):
|
ifd[SOFTWARE] = im.encoderinfo["software"]
|
if im.encoderinfo.has_key("date time"):
|
ifd[DATE_TIME] = im.encoderinfo["date time"]
|
if im.encoderinfo.has_key("artist"):
|
ifd[ARTIST] = im.encoderinfo["artist"]
|
if im.encoderinfo.has_key("copyright"):
|
ifd[COPYRIGHT] = im.encoderinfo["copyright"]
|
|
dpi = im.encoderinfo.get("dpi")
|
if dpi:
|
ifd[RESOLUTION_UNIT] = 2
|
ifd[X_RESOLUTION] = _cvt_res(dpi[0])
|
ifd[Y_RESOLUTION] = _cvt_res(dpi[1])
|
|
if bits != (1,):
|
ifd[BITSPERSAMPLE] = bits
|
if len(bits) != 1:
|
ifd[SAMPLESPERPIXEL] = len(bits)
|
if extra is not None:
|
ifd[EXTRASAMPLES] = extra
|
if format != 1:
|
ifd[SAMPLEFORMAT] = format
|
|
ifd[PHOTOMETRIC_INTERPRETATION] = photo
|
|
if im.mode == "P":
|
lut = im.im.getpalette("RGB", "RGB;L")
|
ifd[COLORMAP] = tuple(map(lambda v: ord(v) * 256, lut))
|
|
# data orientation
|
stride = len(bits) * ((im.size[0]*bits[0]+7)/8)
|
ifd[ROWSPERSTRIP] = im.size[1]
|
ifd[STRIPBYTECOUNTS] = stride * im.size[1]
|
ifd[STRIPOFFSETS] = 0 # this is adjusted by IFD writer
|
ifd[COMPRESSION] = 1 # no compression
|
|
offset = ifd.save(fp)
|
|
ImageFile._save(im, fp, [
|
("raw", (0,0)+im.size, offset, (rawmode, stride, 1))
|
])
|
|
|
# -- helper for multi-page save --
|
if im.encoderinfo.has_key("_debug_multipage"):
|
#just to access o32 and o16 (using correct byte order)
|
im._debug_multipage = ifd
|
|
#
|
# --------------------------------------------------------------------
|
# Register
|
|
Image.register_open("TIFF", TiffImageFile, _accept)
|
Image.register_save("TIFF", _save)
|
|
Image.register_extension("TIFF", ".tif")
|
Image.register_extension("TIFF", ".tiff")
|
|
Image.register_mime("TIFF", "image/tiff")
|
