我想要一个程序来将pdf文件拆分为黑白和彩色页面，因为BW页面打印起来更便宜。我看到了这段似乎能完成任务的代码(摘自github.com/dalemyers/9547783(我看到它的主要优点是，该脚本接收一个PDF并创建两个新的PDF。一个有黑白页，另一个有彩色页。它还需要双面打印考虑在内。因此，与彩色面在同一张纸上的黑白面将被放入彩色PDF中。
然而，我一直无法重现代码。
有人能帮忙吗？
例如，请使用此处的pdf文件，其中包含彩色和BW页面
以下代码：
#!/usr/bin/env python
# Python 2 and 3 compatible.
#This script takes in a PDF and creates two new PDFs. One has the black and
#white pages and the other has the colour pages. It also takes duplex printing
#into account. So a black and white side which is on the same sheet as a colour
#side will be placed into the colour PDF.
#This is from a script created by Iain Murray. The original comment is below.
#This version simply has some different defaults and removes the PDFtoPPM.
#Original ######################################################################
# Python program to take a pdf file, and split it into color and black
# and white part(s). Requires pdftk and one of gs and pdftoppm.
#
# Iain Murray, February 2010.
#
# Inspired by dvicoloursplit.py, Jeremy Sanders 2001, although written
# from scratch.
#
# 2011-09-19 fixed bug with odd numbers of pages reported by Richard Shaw
# 2012-06-11 tweaked to run in Python 3 as well as 2.
#End Original ##################################################################
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
import os, os.path, sys, string, re, tempfile, shutil, getopt
def a2b(x):
"""Turn ascii into bytes for Python 3, in way that works with Python 2"""
try:
return bytes(x)
except:
return bytes(x, 'ascii')
def iscolorppm(filename):
"""Does the PPM file contain any non-grayscale colors?"""
file = open(filename, 'rb')
# Ugly: I read the whole file into RAM, and copy it needlessly a lot
data = file.read()
file.close()
# PPM is a *very* liberal file format. It allows comments anywhere in the
# header, even in the middle of tokens.
comments_re = re.compile(a2b('^([^ tn]*)#[^n]*n'))
split_re = re.compile(a2b('^([ tn]|#[^n]*n)+([^ tn#])'))
tok_re = re.compile(a2b('^([^ tn]*)([ tn].*)'), re.DOTALL)
toks = []
while len(toks) < 4:
while split_re.match(data):
data = split_re.sub(r'2', data)
while comments_re.match(data):
data = comments_re.sub(r'1', data)
(tok, data) = tok_re.match(data).groups()
toks.append(tok)
magic = toks[0]
(width, height, max_color) = map(int, toks[1:])
data = data[1:]
if magic == b'P3':
binary = False
elif magic == b'P6':
binary = True
else:
print("%s is not a valid PPM file" % filename)
sys.exit(1)
# Massage data so adjacent triples should have the same value in b/w images
data_len = width*height*3
if binary:
if int(max_color) > 255:
# Untested. Each intensity is in two bytes.
data_len *= 2
data = data[1:data_len:2] + data[:data_len:2]
else:
data = [int(x) for x in data.split()]
if len(data) < data_len:
print('PPM file is truncated?')
sys.exit(1)
triples = zip(data[0:data_len:3], data[1:data_len:3], data[2:data_len:3])
black_and_white = all((a==b and a==c for (a,b,c) in triples))
return not black_and_white
def pdfcolorsplit(file, doublesided, merge, verbose):
# Work out which pages are color
if verbose:
print('Analyzing %s...' % file)
tmpdir = tempfile.mkdtemp(prefix = 'pdfcs_')
gs_opts = '-sDEVICE=ppmraw -dBATCH -dNOPAUSE -dSAFE -r20'
if not verbose:
gs_opts += ' -q'
os.system('gs ' + gs_opts + ' -sOutputFile="%s" "%s"'
% (os.path.join(tmpdir, 'tmp%06d.ppm'), file))
PPMs = os.listdir(tmpdir)
PPMs.sort()
iscolor = [iscolorppm(os.path.join(tmpdir, x)) for x in PPMs]
num_pages = len(iscolor)
shutil.rmtree(tmpdir)
if doublesided:
# Treat as color those b/w pages that share a sheet with a color page
iscolorpair = [x or y for (x,y) in zip(iscolor[::2], iscolor[1::2])]
iscolor[:2*len(iscolorpair):2] = iscolorpair
iscolor[1::2] = iscolorpair
# Construct page range strings
flips = [x for x in range(2,num_pages+1) if iscolor[x-1] != iscolor[x-2]]
if not flips:
if verbose:
print('No splitting needs to be done, skipping %s' % file)
return
edges = [1] + flips + [num_pages+1]
ranges = ['%d-%d' % (x,y-1) for (x,y) in zip(edges[:-1], edges[1:])]
# Finally output split files
if verbose:
print('Outputing splits as new pdf files...')
base_name = file
if base_name.lower().endswith('.pdf'):
base_name = base_name[:-4]
suffixes = ['_bwsplit.pdf', '_colorsplit.pdf']
# jobs is a seq of (range, filename) pairs, e.g. ('1-3', 'colorbits.pdf')
if merge:
jobs = ((' '.join(ranges[0::2]), base_name + suffixes[iscolor[0]]),
(' '.join(ranges[1::2]), base_name + suffixes[not iscolor[0]]))
else:
jobs = [(r, '%s_%03d%s' % (base_name,n+1,suffixes[(n+iscolor[0])%2]))
for (n,r) in enumerate(ranges)]
for (pages, name) in jobs:
if verbose:
print('pdftk "%s" cat %s output "%s"' % (file, pages, name))
os.system('pdftk "%s" cat %s output "%s"' % (file, pages, name))
def usage():
progname = os.path.basename(sys.argv[0])
print('Usage: %s [OPTIONS] <PDF-file(s)>' % progname)
print('')
print('Splits PDF files into color and black and white sections.')
print('')
print('Options:')
print(' -m Write out the file in multiple parts rather than a PDF for')
print(' each different section')
print(' -s option chooses simplex rather than duplex output')
print(' -v verbose.')
def main():
try:
opt_pairs, filenames = getopt.gnu_getopt(sys.argv[1:], "hvpms", ["help"])
except getopt.GetoptError as err:
print(str(err))
usage()
sys.exit(1)
if opt_pairs:
opts = list(zip(*opt_pairs))[0]
else:
opts = []
if ('-h' in opts) or ('--help' in opts) or (not filenames):
usage()
sys.exit()
verbose = '-v' in opts
use_pdftoppm = '-p' in opts
merge = '-m' not in opts
doublesided = '-s' not in opts
for file in filenames:
pdfcolorsplit(file, doublesided, merge, verbose)
if __name__ == "__main__":
main()
解决方案：打开您的命令提示符(在我的例子中：Anaconda prompt作为管理员(。安装依赖项：pypdftk、gs和pdf2image
转到包含目标文件(我将其命名为filename(的目标文件夹
(base) C:Usersfolder>pdfcoloursplitter.py
Usage: pdfcoloursplitter.py [OPTIONS] <PDF-file(s)>
Splits PDF files into color and black and white sections.
Options:
-m Write out the file in multiple parts rather than a PDF for
each different section
-s option chooses simplex rather than duplex output
-v verbose.
C:Usersfolder>pdfcoloursplitter.py -m filename.pdf