Adobe 5.5 Design Standard Manual de usuario Pagina 125

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Adobe Creative Suite 5 Printing Guide 123
• Images: Choose options according to your output workow. 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 beer results on images such as
photographs with gradual color transitions. ZIP is the beer choice
for illustrations with large areas of solid, at color or paerns 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: Flaen transparency in the document, using default
options for Low, Medium, and High Resolution. If you saved a
custom aener style in the Flaener Preview, it’s available here.
For high-quality printing, it is best to use the High Resolution
option or create a custom aener style appropriate for your
particular workow 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
aen form elds does not delete form eld content, but aens
and embeds that content as visible artwork.
•Discard User Data: Delete comments, le aachments, 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 aect 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 workows. As with links and
bookmarks, deleting these aspects of the PDF may impair
navigation when viewed on screen, but has no adverse eect 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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