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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
#
# The Python Imaging Library.
# $Id: PdfImagePlugin.py 2438 2005-05-25 21:09:48Z Fredrik $
#
# PDF (Acrobat) file handling
#
# History:
# 1996-07-16 fl Created
# 1997-01-18 fl Fixed header
# 2004-02-21 fl Fixes for 1/L/CMYK images, etc.
# 2004-02-24 fl Fixes for 1 and P images.
#
# Copyright (c) 1997-2004 by Secret Labs AB. All rights reserved.
# Copyright (c) 1996-1997 by Fredrik Lundh.
#
# See the README file for information on usage and redistribution.
#
##
# Image plugin for PDF images (output only).
##
__version__ = "0.4"
import Image, ImageFile
import StringIO
#
# --------------------------------------------------------------------
# object ids:
# 1. catalogue
# 2. pages
# 3. image
# 4. page
# 5. page contents
def _obj(fp, obj, **dict):
fp.write("%d 0 obj\n" % obj)
if dict:
fp.write("<<\n")
for k, v in dict.items():
if v is not None:
fp.write("/%s %s\n" % (k, v))
fp.write(">>\n")
def _endobj(fp):
fp.write("endobj\n")
##
# (Internal) Image save plugin for the PDF format.
def _save(im, fp, filename):
#
# make sure image data is available
im.load()
xref = [0]*(5+1) # placeholders
fp.write("%PDF-1.2\n")
fp.write("% created by PIL PDF driver " + __version__ + "\n")
#
# Get image characteristics
width, height = im.size
# FIXME: Should replace ASCIIHexDecode with RunLengthDecode (packbits)
# or LZWDecode (tiff/lzw compression). Note that PDF 1.2 also supports
# Flatedecode (zip compression).
bits = 8
params = None
if im.mode == "1":
filter = "/ASCIIHexDecode"
colorspace = "/DeviceGray"
procset = "/ImageB" # grayscale
bits = 1
elif im.mode == "L":
filter = "/DCTDecode"
# params = "<< /Predictor 15 /Columns %d >>" % (width-2)
colorspace = "/DeviceGray"
procset = "/ImageB" # grayscale
elif im.mode == "P":
filter = "/ASCIIHexDecode"
colorspace = "[ /Indexed /DeviceRGB 255 <"
palette = im.im.getpalette("RGB")
for i in range(256):
r = ord(palette[i*3])
g = ord(palette[i*3+1])
b = ord(palette[i*3+2])
colorspace = colorspace + "%02x%02x%02x " % (r, g, b)
colorspace = colorspace + "> ]"
procset = "/ImageI" # indexed color
elif im.mode == "RGB":
filter = "/DCTDecode"
colorspace = "/DeviceRGB"
procset = "/ImageC" # color images
elif im.mode == "CMYK":
filter = "/DCTDecode"
colorspace = "/DeviceCMYK"
procset = "/ImageC" # color images
else:
raise ValueError("cannot save mode %s" % im.mode)
#
# catalogue
xref[1] = fp.tell()
_obj(fp, 1, Type = "/Catalog",
Pages = "2 0 R")
_endobj(fp)
#
# pages
xref[2] = fp.tell()
_obj(fp, 2, Type = "/Pages",
Count = 1,
Kids = "[4 0 R]")
_endobj(fp)
#
# image
op = StringIO.StringIO()
if filter == "/ASCIIHexDecode":
if bits == 1:
# FIXME: the hex encoder doesn't support packed 1-bit
# images; do things the hard way...
data = im.tostring("raw", "1")
im = Image.new("L", (len(data), 1), None)
im.putdata(data)
ImageFile._save(im, op, [("hex", (0,0)+im.size, 0, im.mode)])
elif filter == "/DCTDecode":
ImageFile._save(im, op, [("jpeg", (0,0)+im.size, 0, im.mode)])
elif filter == "/FlateDecode":
ImageFile._save(im, op, [("zip", (0,0)+im.size, 0, im.mode)])
elif filter == "/RunLengthDecode":
ImageFile._save(im, op, [("packbits", (0,0)+im.size, 0, im.mode)])
else:
raise ValueError("unsupported PDF filter (%s)" % filter)
xref[3] = fp.tell()
_obj(fp, 3, Type = "/XObject",
Subtype = "/Image",
Width = width,
Height = height,
Length = len(op.getvalue()),
Filter = filter,
BitsPerComponent = bits,
DecodeParams = params,
ColorSpace = colorspace)
fp.write("stream\n")
fp.write(op.getvalue())
fp.write("\nendstream\n")
_endobj(fp)
#
# page
xref[4] = fp.tell()
_obj(fp, 4)
fp.write("<<\n/Type /Page\n/Parent 2 0 R\n"\
"/Resources <<\n/ProcSet [ /PDF %s ]\n"\
"/XObject << /image 3 0 R >>\n>>\n"\
"/MediaBox [ 0 0 %d %d ]\n/Contents 5 0 R\n>>\n" %\
(procset, width, height))
_endobj(fp)
#
# page contents
op = StringIO.StringIO()
op.write("q %d 0 0 %d 0 0 cm /image Do Q\n" % (width, height))
xref[5] = fp.tell()
_obj(fp, 5, Length = len(op.getvalue()))
fp.write("stream\n")
fp.write(op.getvalue())
fp.write("\nendstream\n")
_endobj(fp)
#
# trailer
startxref = fp.tell()
fp.write("xref\n0 %d\n0000000000 65535 f \n" % len(xref))
for x in xref[1:]:
fp.write("%010d 00000 n \n" % x)
fp.write("trailer\n<<\n/Size %d\n/Root 1 0 R\n>>\n" % len(xref))
fp.write("startxref\n%d\n%%%%EOF\n" % startxref)
fp.flush()
#
# --------------------------------------------------------------------
Image.register_save("PDF", _save)
Image.register_extension("PDF", ".pdf")
Image.register_mime("PDF", "application/pdf")
|