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Adobe Creative Suite 5 Printing Guide 123
• Images: Choose options according to your output workow. is
option downsamples or compresses color, grayscale, and black-
and-white images. Downsampling reduces le size by lowering the
resolution of images. is is accomplished by averaging the colors
of several pixels and merging them into larger pixels of the average
color. Compression reduces le size by eliminating unnecessary
pixel data. In general, JPEG gives beer results on images such as
photographs with gradual color transitions. ZIP is the beer choice
for illustrations with large areas of solid, at color or paerns made
up of at colors. For monochrome images, JBIG2 compression,
which is available in PDF Optimizer but not in Acrobat Distiller, is
superior to CCITT. If you’re using JPEG or JPEG2000 compression,
specify maximum quality because JPEG and JPEG2000 compres-
sion methods are typically lossy, resulting in some permanent data
loss. For JPEG2000 compression, you can also specify lossless so
that no pixel data is removed. Compression for monochrome
images is lossless, except for JBIG2 compression, which provides
both lossy and lossless modes of compression.
•Fonts: Choose whether to unembed fonts to reduce le size.
However, for high-end printing, Adobe recommends embedding all
fonts. Check to make sure the font supplier allows embedding.
•Transparency: Flaen transparency in the document, using default
options for Low, Medium, and High Resolution. If you saved a
custom aener style in the Flaener Preview, it’s available here.
For high-quality printing, it is best to use the High Resolution
option or create a custom aener style appropriate for your
particular workow system.
•Discard Objects: Remove objects, such as embedded page thumb-
nails, bookmarks, and document tags from the PDF document.
ere are also options to convert smooth lines to curves and
merge image fragments. Several of the options allow you to delete
content that has nothing to do with imaging the document, such as
JavaScript actions, search indexes, and form actions. e option to
aen form elds does not delete form eld content, but aens
and embeds that content as visible artwork.
•Discard User Data: Delete comments, le aachments, private
data embedded by other applications, and hidden layer content.
•Clean Up: Remove unnecessary items from the document. By
default, only elements that do not aect functionality are selected.
If you are unsure of the implications of removing other options, you
should use the default selections. You can choose from these
options:
• Object Compression Options: Lets you remove all compression
or compress document structure. If you’ve chosen compatibility
with Acrobat 6.0 or later, you can also compress the entire le or
leave the compression unchanged.
• Use Flate To Encode Streams at Are Not Encoded: Analyzes if
applying compression to a particular stream will reduce le size.
Compression is applied only if le size will be reduced.
• In Streams at Use LZW Encoding, Use Flate Instead: Replaces
LZW encoding with Flate encoding.
• Remove Invalid Bookmarks/Remove Invalid Links: Eliminates
bookmarks and links that point to deleted pages or to other
invalid destinations.
• Remove Unreferenced Named Destinations: Deletes named des-
tinations that the PDF document does not reference internally.
Because this option does not check for links from other PDF les
or websites, it may not t in some workows. As with links and
bookmarks, deleting these aspects of the PDF may impair
navigation when viewed on screen, but has no adverse eect on
imaging.
• Optimize e PDF For Fast Web View: Restructures a PDF
document for page-at-a-time downloading (byte-serving) from
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