Adobe Acrobat XI - Manual (Page 208)

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Editing PDFs
Last updated 1/14/2015
Optimize Images Only If There Is A Reduction In Size When selected, if the image setting will cause an increase in file
size, the optimization for that image is skipped.
Fonts panel
To ensure an exact match to the source document, it’s a good idea to embed all fonts used in the document. If you don’t
need an exact match and you prefer a smaller file, you can choose not to embed fonts for roman text and East Asian
text (Traditional Chinese, Simplified Chinese, Korean, and Japanese). Text in these languages is replaced with a
substitution font when viewed on a system that does not have the original fonts. The Fonts panel of the PDF Optimizer
contains two lists for fonts: fonts that are available for unembedding, and fonts to unembed. Certain fonts aren’t
available for unembedding and don’t appear in the Fonts panel. To unembed fonts in a document, select one or more
fonts in the Embedded Fonts list, and click the Unembed button. If you don’t want to embed subsets of the embedded
fonts, deselect Subset All Embedded Fonts. To prevent unembedding for all fonts in the document, select Do Not
Unembed Any Font.
Transparency panel
If your PDF includes artwork that contains transparency, you can use presets in the Transparency panel of PDF
Optimizer to flatten transparency and reduce file size. (Flattening incorporates transparency into corresponding
artwork by sectioning it into vector-based areas and rasterized areas.) PDF Optimizer applies transparency options to
all pages in the document before applying other optimization options.
If you select the Acrobat 4.0 And Later compatibility setting, the Transparency panel is enabled and all transparency in
the file is flattened during optimization. This ensures compatibility with Acrobat 4.0 and earlier, which doesn’t support
transparency.
When you create flattening presets, they appear with the default presets in the Transparency panel.
Note: Transparency flattening cannot be undone after the file is saved.
Discard Objects panel
The Discard Objects panel lets you specify objects to remove from the PDF and lets you optimize curved lines in CAD
drawings. You can discard objects created in Acrobat and in other applications. Selecting an object removes all
occurrences of that object within the PDF.
In the Discard Objects area, you can select from these and other options:
Discard All Form Submission, Import And Reset Actions Disables all actions related to submitting or importing form
data, and resets form fields. This option retains form objects to which actions are linked.
Flatten Form Fields Makes form fields unusable with no change to their appearance. Form data is merged with the page
to become page content.
Discard All JavaScript Actions Removes any actions in the PDF that use JavaScript.
Discard All Alternate Images Removes all versions of an image except the one destined for on-screen viewing. Some
PDFs include multiple versions of the same image for different purposes, such as low-resolution on-screen viewing and
high-resolution printing.
Discard Embedded Page Thumbnails Removes embedded page thumbnails. This is useful for large documents, which
can take a long time to draw page thumbnails after you click the Page Thumbnails button.
Discard Document Tags Removes tags from the document, which also removes the accessibility and reflow capabilities
for the text.
Convert Smooth Lines To Curves Reduces the number of control points used to build curves in CAD drawings, which
results in smaller PDF files and faster on-screen rendering.