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C H A P T E R S I X Complying with PDF and Accessibility Standards
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Screen 3. Choose tagging options. You can choose to let Acrobat infer
the reading order or specify a preference. Also in this panel, choose to
override reading order in a tagged document, or conrm tagging in an
untagged document.
•
Screen 4. Select an option for viewing large documents. You can
choose to deliver the visible pages or the entire document, or you can
let Acrobat decide. If you prefer, you can have all the pages delivered
for a small document. Click the Maximum number of pages in a small
document eld and type a number. The default is 50 pages. Choose an
option to have Acrobat override a page layout style and use the single
page default, which is best for many screen readers. Finally, specify a
default document zoom value.
•
Screen 5. The fth and nal screen gives you an option to disable
document auto-save, which, when enabled, can cause the document
to reload and begin reading from the start of the document. You can
choose to reopen the document from the last viewed page—which
is terric when you’re working with long documents. Finally, you can
also choose to open a PDF document in Acrobat or a browser; opening
a document in Acrobat is less confusing for some assistive devices.
Colors to Avoid
If you know that vision-
impaired users will be viewing
your documents, be careful
with the colors you choose.
One of the biggest problems
is light-colored backgrounds.
Although a pale background
behind a title looks attrac-
tive on a white background, if
you use a high-contrast color
scheme, for example, the text
becomes virtually illegible.
The light background and
the light text used for high-
contrast schemes are too
similar in color, making the
text hard to read—like the
example in Figure 46.
Planning Documents for PDF Accessibility
The key to successful tagging of a document as well as making it comfortable
for a user working with a screen reader is to use your source programs’ features
efficiently. Plan ahead:
•
Configure the document pages correctly. For example, don’t add blank lines
to make a space.
•
Check the styles attached to inserted material such as images and charts.
•
Group tables and charts or convert them to an image to prevent creating indi-
vidual tags for each line and word segment.
From the Library of Daniel Dadian
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