Learning Centers

Acrobat 6 First Look - PDF Optimizer

April 22, 2003


Editor's Note: This article is part of the Adobe Acrobat 6.0 Learning Center

Both Acrobat Standard and Professional include a menu item (File, Reduce File Size) for reducing the file size of the current document. The size of the resulting document will vary depending on the compatibility of the Acrobat version compatibility you select.

By selecting the version compatibility, such as Acrobat 4.0 and later, 5.0 and later or 6.0 and later, Acrobat 6 will make its best efforts at compressing your document with the available technologies for each particular version of Acrobat (or more correctly the PDF specification with that version). For example, the newest version of Acrobat includes support for JBIG2 and JPEG2000 image compression technologies.

PDF Optimizer

The PDF Optimizer -- an Acrobat Professional-only tool -- expands on the poorly named PDF Consultant in Acrobat 5 -- it allow you to examine the space usage of different elements of a PDF file and then allowed you to remove them from the PDF to reduce its size. Like PDF Consultant, PDF Optimizer can also be used in Batch Sequences.

PDF Optimizer extends the functionality of the PDF Consultant so that in essence the tool becomes more like a 'redistiller' or 'refryer' (the term used by many in the PDF community for redistilling a PDF). So, like Acrobat Distiller, you have options to downsample images and un/embed fonts as well as remove document elements, including fonts, comments, form actions, document structure, hidden layer content and the like.



Adaptive Compression

PDF Optimizer includes a different type called Adaptive Compression. When this is selected the Image Settings options are not available. Acrobat's user guide describes what it does as follows:

Acroscan applies advanced image processing to images in the PDF file, including segmentation, edge shadow removal, deskewing, pepper removal, and dehalftoning.

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