optimization - How to optimize PDF file size? -


I have an input pdf file (usually but not always generated by pdftex), which I convert to an output pdf I want, which is visually equal (no proposal), it has the same metadata (Unicode text information, hyperlinks, profile etc.), but the size of the file is probably as small as possible.

I know the following methods:

  • java-cp multivalent.page.pdf.compress.index.pdf (from) all this stream Recompresses, removes unused objects, adds equivalent objects, compresses white space, removes default values, compresses cross-reference tables.
  • Repeated pressures with appropriate images with jbig2 and PNGOUT.
  • Re
  • Unifying identical images.
  • The subset containing the integration of a large subset of the same font.
  • Remove the filling form.
  • Distilled or otherwise converting (such as gs -sDEVICE = pdfwrite ), make sure it does not notify image quality, and image (!) Image Size does not increase.

I know about the following techniques, but they are not applicable in my case because I already have a PDF:

  • Small And / or use less fonts.
  • Use vector images instead of bitmap images.

Do you have any other ideas to optimize PDFs?

Optimized PDF files

Avoid Referrals Graphics

Graphics should be inserted as a bitmap, ready for maximum sanitation and minimum dimensions. Use the best quality images at PDF output output. Insert the compressed JPEG into the pdf and distill them to zpeg again, which can create noticeable artifacts. To allow the use of new JBIG2 standard with superiority in monochromatic compression, use text instead of black and white images and color images. Be sure to close thumbnails when saving PDFs for the Web Use vector graphics

Use vector-based graphics where it is possible for images that will usually be created in GIF. Vector images fully scale, seem surprising, and their mathematical formulas generally take less space compared to bitmap graphics that describe every pixel (though in some cases where bitmap graphics are actually compared to vector graphics Are small) You can also compress vector image data using zip compression, which is built in pdf format. Acrobat Reader versions 5 and 6 also support the SVG standard. Minimize the fonts

How you use fonts in particular small PDFs, can have a significant effect on the file size, used in your documents to reduce their effect on the file size. Minimize the number of fonts Each additional fully embedded font can easily carry 40K in the file size, which is why most authors create "subscribed" fonts Flat form of fat form which include glyphs actually used

Acrobat Form can take a lot of space in your PDFs New in Acrobat 8 ​​Pro you can upgrade -> PDF Optimizer -> Objects Drop the dialogs to level the form fields. Form fields of flat forms are unusable and form data merge with the page. You can also use PDF Enhancer from Apgawa to reduce the form by 50% by removing the information contained in the file but can not actually be used at any time. You can add a refridged PDF to the old form pages to create a hybrid PDF in Acrobat (see the "Refried PDF" section below).

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