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Included a link that has guidelines to make a PDFx-1a files.
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The best compression technique I use for making PDF's smaller without loosing quality is saving it using the Adobe PDF Preset: PDF/X-1a:2001.

 Screeshot of the "Save Adobe PDF" Panel in Illustrator CS6

How it makes the file smaller is by defining a set of rules that forbid the use of certain PDF functions that are irrelevant for printing purposes and to enforce others that do improve its usefulness in prepress.

For more information you can read: http://kwikkopydc.com/tenley/2012/03/for-best-results-learn-how-to-create-pdfx-1a-files/

The best compression technique I use for making PDF's smaller without loosing quality is saving it using the Adobe PDF Preset: PDF/X-1a:2001.

 Screeshot of the "Save Adobe PDF" Panel in Illustrator CS6

How it makes the file smaller is by defining a set of rules that forbid the use of certain PDF functions that are irrelevant for printing purposes and to enforce others that do improve its usefulness in prepress.

The best compression technique I use for making PDF's smaller without loosing quality is saving it using the Adobe PDF Preset: PDF/X-1a:2001.

 Screeshot of the "Save Adobe PDF" Panel in Illustrator CS6

How it makes the file smaller is by defining a set of rules that forbid the use of certain PDF functions that are irrelevant for printing purposes and to enforce others that do improve its usefulness in prepress.

For more information you can read: http://kwikkopydc.com/tenley/2012/03/for-best-results-learn-how-to-create-pdfx-1a-files/

Source Link

The best compression technique I use for making PDF's smaller without loosing quality is saving it using the Adobe PDF Preset: PDF/X-1a:2001.

 Screeshot of the "Save Adobe PDF" Panel in Illustrator CS6

How it makes the file smaller is by defining a set of rules that forbid the use of certain PDF functions that are irrelevant for printing purposes and to enforce others that do improve its usefulness in prepress.