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PDF Generator supports the ability to reduce the size of
PDF files. Whether you use all these settings or only a few depends
on how you intend to use the files and on the essential properties
that a file must have. In most cases, the default settings are appropriate
for maximum efficiency - saving space by removing embedded fonts,
compressing images, and removing items from the files that are no
longer needed.
Note: Optimizing a digitally signed document removes
and invalidates the digital signatures.
For instructions about accessing this setting, see Create or edit file type settings.
- Target PDF Version:
- Specifies the version of Acrobat that the PDF is compatible with.
Fonts* New for LiveCycle ES4*
You can choose if you want to unembed all fonts embedded in a
document or unembed only specific fonts. You can also unembed the
portions of fonts that are not in use in a document. Select Fonts.
Select one of the following options:
- Unembed all fonts
- Unembeds all embedded fonts
- Do not unembed any font
- Does not unembed any fonts
- Unembed some fonts
- Unembeds only the specified fonts. Follow these steps to
specify the fonts that you want to unembed:
If necessary,
select a different fonts directory from the Font source drop-down
menu. This drop-down menu lists fonts directories specified in Home > Settings > Core System > Core Configurations.
Select one or more fonts from the Available Fonts list
and click Add. These fonts are added to the Fonts to Unembed list.
If you want to unembed some fonts that don’t exist on the
LiveCycle server, enter the names of those fonts in the Add fonts to unembed box.
Click Add.
 If you want to
unembed some fonts whose subsets are embedded in the document, prefix
the font name with the + sign. For example, “+Helvetica”.
If you want to embed only the in-use subsets of the embedded
fonts, select Subset all embedded fonts.
Note: If you’re
using this option in combination with Unembed some fonts,
fonts in the Add fonts to unembed list are still completely
unembedded.
Font subsetting is the technique
of embedding only a portion of a font. A font subset contains only
the characters used in your document.
Transparency*New for LiveCycle ES4*
If your PDF document includes artwork that contains transparency,
you can use the PDF Optimizer settings to flatten transparency and
reduce file size.
If Acrobat 4.0 and later is selected as the Target PDF version,
all transparent objects are flattened. For other Target PDF versions,
transparency is supported and you can configure the transparency
settings.
 Select Transparency to configure the transparency
settings while optimizing PDF documents. - Transparency level
- Specifies the amount of vector information that will be preserved.
Higher settings preserve more vector objects, while lower settings rasterize
more vector objects; intermediate settings preserve simple areas
in vector form and rasterize complex ones. Select the lowest setting
to rasterize all the artwork.
Note: The amount of rasterization
that occurs depends on the complexity of the page and the types
of overlapping objects.
- Line Art and Text
- Resolution to which all objects, including images, vector artwork,
text, and gradients, are rasterized. The supported values are 1
pixels per inch (ppi) to 9600 ppi.
Line Art and
Text resolution should generally be set to 600-1200 ppi to provide high-quality
rasterization, especially on serif or small point sized type. - Gradient and Meshes
- Resolution to which gradient and meshes are rasterized. The
supported values are 1 ppi to 1200 ppi.
Gradient
and mesh resolution should generally be set to 150-300 ppi, because the
quality of the gradients, drop shadows, and feathers do not improve
with higher resolutions, but printing time and file size increase. - Convert All Text to Outlines
- Converts all type objects (point type, area type, and path
type) to outlines and discards all type glyph information on pages containing
transparency. This option ensures that the width of text stays consistent
during flattening. Note that enabling this option will cause small fonts
to appear slightly thicker when viewed in Acrobat or printed on
low-resolution desktop printers. It doesn’t affect the quality of
the type printed on high-resolution printers or imagesetters.
- Convert All Strokes to Outlines
- Converts all strokes to simple filled paths on pages containing
transparency. This option ensures that the width of strokes stays
consistent during flattening. Note that enabling this option causes
thin strokes to appear slightly thicker and may degrade flattening
performance.
- Clip Complex Regions
- Ensures that the boundaries between vector artwork and rasterized
artwork fall along object paths. This option reduces stitching artifacts
that result when part of an object is rasterized while another part
of the object remains in vector form. However, selecting this option
may result in paths that are too complex for the printer to handle.
Note: Some
print drivers process raster and vector art differently, sometimes resulting
in color stitching. You may be able to minimize stitching problems
by disabling some print-driver specific color-management settings.
These settings vary with each printer, so see the documentation
that came with your printer for details.
- Preserve Overprint
- Blends the color of transparent artwork with the background
color to create an overprint effect.
Images Select Images to specify compression and
resampling options for color, grayscale, and monochrome images.
You may want to experiment with these options to find an appropriate
balance between file size and image quality.
The resolution setting for color and grayscale images should
be 1.5 to 2 times the line screen ruling at which the file will
be printed. The resolution for monochrome images should be the same
as the output device, but be aware that saving a monochrome image
at a resolution higher than 1500 dpi increases the file size without
noticeably improving image quality. Images that will be magnified,
such as maps, may require higher resolutions.
Note: Resampling monochrome images can have unexpected viewing results,
such as no image display. If this happens, turn off resampling and
convert the file again. This problem is most likely to occur with
subsampling, and least likely with bicubic downsampling.
The following table shows common types of printers and their
resolution measured in dpi, their default screen ruling measured
in lines per inch (lpi), and a resampling resolution for images
measured in pixels per inch (ppi). For example, if you were printing
to a 600-dpi laser printer, you would enter 170 for the resolution
at which to resample images.
Printer resolution
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Default line screen
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Image resolution
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300 dpi (laser printer)
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60 lpi
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120 ppi
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600 dpi (laser printer)
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85 lpi
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170 ppi
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1200 dpi (imagesetter)
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120 lpi
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240 ppi
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2400 dpi (imagesetter)
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150 lpi
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300 ppi
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Discard Objects Select Discard Objects to specify objects
to remove from the PDF and to optimize curved lines in CAD drawings. - Discard All Form Submission, Import And Reset Actions:
- Disables all actions that are related to submitting or importing
form data, and resets form fields. This option retains form objects
that actions are linked to.
- Discard All JavaScript Actions:
- Removes from the PDF any actions that use JavaScript.
- Discard Embedded Page Thumbnails:
- Removes embedded page thumbnails. This option is useful for
large documents, which can take a long time to draw page thumbnails
after you click the Pages button.
- 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 onscreen
rendering.
- Discard Embedded Print Settings:
- Removes embedded print settings, such as page scaling and
duplex mode, from the document.
- Discard Bookmarks:
- Removes all bookmarks from the document.
- 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 Alternate Images:
- Removes all versions of an image except the version that
is destined for onscreen viewing. Some PDFs include multiple versions
of the same image for different purposes, such as low-resolution onscreen
viewing and high-resolution printing.
- Discard Document Tags:
- Removes tags from the document, which also removes the accessibility
and reflow capabilities for the text.
- Detect And Merge Image Fragments:
- Looks for images or masks that are fragmented into thin slices
and tries to merge the slices into a single image or mask.
- Discard Embedded Search Index:
- Removes embedded search indexes, which reduces file size.
Discard User Data Select Discard User Data to remove any personal
information that you do not want to distribute or share with other
users. - Discard All Comments, Forms And Multimedia:
- Removes all comments, forms, form fields, and multimedia
from the PDF.
- Discard All Object Data:
- Removes all objects from the PDF.
- Discard External Cross References:
- Removes links to other documents. Links that jump to other
locations within the PDF are not removed.
- Discard Hidden Layer Content And Flatten Visible Layers:
- Decreases file size. The optimized document looks like the
original PDF but does not contain layer information.
- Discard Document Information And Metadata:
- Removes information in the document information dictionary
and all metadata streams. (Use the Save As command to restore metadata
streams to a copy of the PDF.)
- Discard File Attachments:
- Removes all file attachments, including attachments added
to the PDF as comments. (PDF Optimizer does not optimize attached
files.)
- Discard Private Data Of Other Applications:
- Strips information from a PDF document that is useful only
to the application that created the document. This setting does
not affect the functionality of the PDF, but it does decrease the
file size.
Clean Up Select Clean Up to remove unnecessary items from
the document.
These items include elements that are obsolete or unnecessary
for your intended use of the document. Removing certain elements
can seriously affect the functionality of the PDF. By default, only
elements that do not affect functionality are selected. If you are
unsure of the implications of removing other options, use the default
selections.
- Compression
- Select one of the following Flate compression options from
the drop-down menu:
- Use Flate To Encode Streams That Are Not Encoded:
- Applies Flate compression to all streams that are not encoded.
- Discard Invalid Bookmarks:
- Removes bookmarks that point to pages in the document that
are deleted.
- Discard Unreferenced Named Destinations:
- Removes named destinations that are not being referenced
internally from within the PDF document. This option does not check
for links from other PDF files or websites.
- Optimize The PDF For Fast Web View:
- Restructures a PDF document for page-at-a-time downloading
(byte-serving) from web servers.
- In Streams That Use LZW Encoding, Use Flate Instead:
- Applies Flate compression to all content streams and images
that use LZW encoding.
- Discard Invalid Links:
- Removes links that jump to invalid destinations.
- Optimize Page Content:
- Converts all end-of-line characters to space characters,
which improves Flate compression.
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