如何减小包含图像的pdf文件的大小？

我有一个包含图像的pdf文件，我想减小其大小以便将其上传到具有大小限制的网站。

那么，如何从命令行减小pdf文件的大小？

您可以按以下方式使用gs-GhostScript（PostScript和PDF语言解释器和预览器）：

• 将pdfwrite设置为输出设备-sDEVICE=pdfwrite

• 使用适当的-dPDFSETTINGS。

  从文档：

  -dPDFSETTINGS =配置
  将“蒸馏器参数”预设为四个预定义设置之一：
  

  • / screen选择类似于Acrobat Distiller“屏幕优化”设置的低分辨率输出。
  • / ebook选择类似于Acrobat Distiller“ eBook”设置的中等分辨率输出。
  • / printer选择类似于Acrobat Distiller“打印优化”设置的输出。
  • / prepress选择类似于Acrobat Distiller“ Prepress Optimized”设置的输出。
  • / default选择旨在在多种用途中有用的输出，可能以较大的输出文件为代价。

• -o输出文件的选项，该文件也设置-dNOPAUSE和-dBATCH（请参阅与交互有关的参数）

例：

$ du -h file.pdf 
27M file.pdf

$ gs -sDEVICE=pdfwrite -dPDFSETTINGS=/ebook -q -o output.pdf file.pdf

$ du -h output.pdf 
900K    output.pdf

在此-q抑制正常的启动消息，并且也等效于-dQUIET抑制常规信息注释

ps2pdf input.pdf output.pdf

我从ubuntu那里得到了答案，它对我有用。实际上减少了18.1Mb至1.0Mb

您可以尝试以下方法：

$ time pdftk myFile.pdf output myFile__SMALLER.pdf compress
GC Warning: Repeated allocation of very large block (appr. size 16764928):
    May lead to memory leak and poor performance.
GC Warning: Repeated allocation of very large block (appr. size 8384512):
    May lead to memory leak and poor performance.
GC Warning: Repeated allocation of very large block (appr. size 11837440):
    May lead to memory leak and poor performance.
GC Warning: Repeated allocation of very large block (appr. size 8384512):
    May lead to memory leak and poor performance.
GC Warning: Repeated allocation of very large block (appr. size 33525760):
    May lead to memory leak and poor performance.
GC Warning: Repeated allocation of very large block (appr. size 7254016):
    May lead to memory leak and poor performance.
GC Warning: Repeated allocation of very large block (appr. size 34041856):
    May lead to memory leak and poor performance.
GC Warning: Repeated allocation of very large block (appr. size 33525760):
    May lead to memory leak and poor performance.

real    0m23.677s
user    0m23.142s
sys     0m0.540s
$ du myFile*.pdf
108M    myFile.pdf
74M     myFile__SMALLER.pdf

它比gs107.5MiB输入文件要快，但在这种情况下最多可压缩30％。