PDF缩小工具
pdfminif的Python项目详细描述
PDF完善
pdfminify旨在在直接操作PDF时重新压缩PDF图像 级别（即不使用PostScript重新压缩）。它解析PDF文件， 散列所有图像引用，重新链接重复的资源（即 相同的MD5哈希值），也可以重新压缩 以无损压缩方式存储以使用JPEG。它试图计算 图像的物理范围（根据包含方法， 可以有点凌乱）然后才能计算出实际的图像分辨率。 如果它超过了给定的目标分辨率，它也可以重新采样图像（即。， 在将它们重新整合到目标中之前，使用ImageMagick重新缩放它们 PDF格式。在
特别是，我编写这个软件是因为PDF是由libcairo生成的 出口是huange。所使用的图像只包含十几次 使用无损压缩。因此，我使用pdfminify来减少 稍后文件大小。在
pdfminify的另一个用途是它能够将PDF转换成PDF/A-1b 兼容的PDF文件。既然这真的很难做到， 对于生成的PDF没有任何保证--请检查 如果结果仍然与源版本的行为相同，则返回。在
最后，pdfminify能够对PDF文件进行数字签名。为了这个你会的 需要一个X.509证书和相应的密钥对。签名将是 包括在PDF格式的横幅与元数据和复杂的PDF 读者将能够验证PDF没有被篡改。在
要求
pdfminify至少需要python3.5和llpdf Python package至少v0.0.4。而且 使用ImageMagick的“标识”和“转换”实用程序。它使用前者 确定图像的宽度、高度、色彩空间和每个分量的位数 文件和后者转换来自PNM的图像（内部格式 pdfminify能够本机写入）到JPEG。在
致谢
pdfminify使用christophedelord的玩具解析器生成器（TPG） （http://cdsoft.fr/tpg/）。包括在内(tpg.py公司文件）并根据 GNU LGPLv2.1或任何更高版本。尽管它的名字与玩具相去甚远。在 事实上，它是我使用过的最漂亮的解析器生成器 使得语法和语法分析异常简单，即使对于没有语法和语法分析的人来说也是如此 以前的解析经验。如果需要解析并使用Python，TPG是the 选择我推荐的解决方案。说真的，太棒了。过来看。 版权和许可证详细信息可在外部_许可证.md一
使用
$ pdfminify
usage: pdfminify [-h] [-d dpi] [-j] [--jpeg-quality percent]
[--no-downscaling] [--cropbox x,y,w,h]
[--unit {cm,inch,mm,native}] [--one-bit-alpha]
[--remove-alpha] [--background-color color]
[--strip-metadata] [--saveimgdir path] [--raw-output]
[--pretty-pdf] [--no-xref-stream] [--no-object-streams]
[--pdfa-1b] [--color-profile iccfile] [--sign-cert certfile]
[--sign-key keyfile] [--sign-chain pemfile] [--signer name]
[--sign-location hostname] [--sign-contact-info infotext]
[--sign-reason reason] [--sign-page pageno]
[--sign-font pfbfile] [--sign-pos x,y] [--embed-payload path]
[--no-pdf-tagging] [--decompress-data] [--analyze]
[--dump-xref-table] [--no-filters] [-v]
pdf_in pdf_out
Minifies PDF files, can crop them, convert them to PDF/A-1b and sign them
cryptographically.
positional arguments:
pdf_in Input PDF file.
pdf_out Output PDF file.
optional arguments:
-h, --help show this help message and exit
-d dpi, --target-dpi dpi
Default resoulution to which images will be resampled
at. Defaults to 150 dots per inch (dpi).
-j, --jpeg-images Convert images to JPEG format. This means that lossy
compression is used that however often yields a much
higher compression ratio.
--jpeg-quality percent
When converting images to JPEG format, the parameter
gives the compression quality. It is an integer from
0-100 (higher is better, but creates also larger
output files).
--no-downscaling Do not apply downscaling filter on the PDF, take all
images as they are.
--cropbox x,y,w,h Crop pages by additionally adding a /CropBox to all
pages of the PDF file. Pages will be cropped at offset
(x, y) to a width (w, h). The unit in which offset,
width and height are given can be specified using the
--unit parameter.
--unit {cm,inch,mm,native}
Specify the unit of measurement that is used for input
and output. Can be any of cm, inch, mm, native,
defaults to native. One native PDF unit equals 1/72th
of an inch.
--one-bit-alpha Force all alpha channels in images to use a color
depth of one bit. This will make transparent images
have rougher edges, but saves additional space.
--remove-alpha Entirely remove the alpha channel (i.e., transparency)
of all images. The color which with transparent areas
are replaced with can be specified using the
--background-color command line option.
--background-color color
When removing alpha channels, specifies the color that
should be used as background. Defaults to white.
Hexadecimal values can be specified as well in the
format '#rrggbb'.
--strip-metadata Strip metadata inside PDF objects that is not strictly
required, such as /PTEX.* entries inside object
content.
--saveimgdir path When specified, save all handled images as individual
files into the specified directory. Useful for image
extraction from a PDF as well as debugging.
--raw-output When saving images externally, save them in exactly
the format in which they're also present inside the
PDF. Note that this will produce raw image files in
some cases which won't have any header (but just
contain pixel data). Less useful for image extraction,
but can make sense for debugging.
--pretty-pdf Write pretty PDF files, i.e., format all dictionaries
so they're well-readable regarding indentation.
Increases required file size a tiny bit and increases
generation time of the PDF a little, but produces
easily debuggable PDFs.
--no-xref-stream Do not write the XRef table as a XRef stream, but
instead write a classical PDF XRef table and trailer.
This will increase the file size a bit, but might
improve compatibility with old PDF readers (XRef
streams are supported only starting with PDF 1.5).
XRef-streams are a prerequisite to object stream
compression, so if XRef-streams are disabled, so will
also be object streams (e.g, --no-object-streams is
implied).
--no-object-streams Do not compress objects into object-streams. Object
stream compression is introduced with PDF 1.5 and
means that multiple simple objects (without any stream
data) are concatenated together and compressed
together into one large stream object.
--pdfa-1b Try to create a PDF/A-1b compliant PDF document.
Implies --no-xref-stream, --no-object-streams,
--remove-alpha, removes transpacency groups and adds a
PDF/A entry into XMP metadata.
--color-profile iccfile
When creating a PDF/A-1b PDF, gives the Internal Color
Consortium (ICC) color profile that should be embedded
into the PDF as part of the output intent. When
omitted, it defaults to the sRGB IEC61966 v2 "black
scaled" profile which is included within pdfminify.
--sign-cert certfile pdfminify can additionally cryptographically sign your
result PDF file with an X.509 certificate and
corresponding key. This parameter specifies the
certificate filename.
--sign-key keyfile This parameter specifies the key filename, also in PEM
format.
--sign-chain pemfile When signing a PDF, this gives the PEM-formatted
certificate chain file. Can be omitted if this should
not be included in the PKCS#7 signature.
--signer name The name of the person responsible for signing the
document.
--sign-location hostname
The location of the signing; usually this is the
hostname of the computer that the signature is
generated on.
--sign-contact-info infotext
A contact information field under which the signer can
be reached. Usually a phone number of email address.
--sign-reason reason The reason why the document was signed.
--sign-page pageno Page number on which the signature should be
displayed. Defaults to 1.
--sign-font pfbfile To be able to include metadata text in the signature
form, a T1 font must be included into the PDF. This
gives the filename of the font that is to be used for
that purpose. Must be in PFB (PostScript Font Binary)
file format and will be included in the result PDF in
full (i.e., not reduced to the glyphs that are
actually needed). Defaults to the Bitstream Charter
Serif font that is included within pdfminify.
--sign-pos x,y Determines where the signature will be placed on the
page. Units are determined by the --unit variable and
the position is relative to lower left corner.
--embed-payload path Embed an opaque file as a payload into the PDF as a
valid PDF object. This is useful only if you want to
place an easter egg inside your PDF file.
--no-pdf-tagging Omit tagging the PDF file with a reference to
pdfminify and the used version.
--decompress-data Decompress all FlateDecode compressed data in the
file. Useful only for debugging.
--analyze Perform an analysis of the read PDF file and dump out
useful information about it.
--dump-xref-table Dump out the XRef table that was read from the input
PDF file. Mainly useful for debugging.
--no-filters Do not apply any filters on the source PDF whatsoever,
just read it in and write it back out. This is useful
to reformat a PDF and/or debug the PDF reader/writer
facilities without introducing other sources of
malformed PDF generation.
-v, --verbose Show verbose messages during conversation. Can be
specified multiple times to increase log level.
pdfminify version 0.2.1; llpdf version: 0.0.4
虫子
PDF本来就是一种凌乱的格式，解析它真的不漂亮。我已经 只执行我需要实现的，以便完成我的工作。我是 当然，有很多例子表明pdfminify显然不起作用，或者 创建损坏的输出PDF。请随时纠正这些错误并发送 拉取请求。我认为这是一个真正有用的工具，因此会很好 支持更多种类的PDF，而不仅仅是我碰巧生成的那些。在
如果您遇到一个问题，但由于您不知道而无法解决它 关于Python，PDF（或两者之一）的内容已经足够了，如果您 Giton集线器报告。但是由于时间不够，我不能保证 可以解决它--说实话，PDF太复杂了，我甚至不确定 找到问题所在。在任何情况下，一定要包括一个最小的例子 演示bug报告中问题的PDF文件。在
许可证
pdfminify是在GNU GPL v3下获得许可的（除了外部组件as 它拥有自己的许可证）。更高版本的GPL是显式的 排除。在
TPG（Toy Parser Generator）属于其各自的许可（请参见 外部_许可证.md). 在
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