Adobe 62000112DM User Guide - Page 302

ADOBE ACROBAT 3D VERSION 8 295 User Guide Override The Reading Order In Tagged Documents Uses the reading order specified in the Reading preferences instead of that specified by the tag structure of the document. Use this preference only when you encounter problems in poorly tagged PDFs. This preference corresponds to the Override The Reading Order In Tagged Documents option in the Accessibility Setup Assistant. Page Vs Document This preference determines how much of a document is delivered to a screen reader at a time. If a PDF isn't tagged, Acrobat may analyze the document and attempt to infer its structure and reading order, which can take a long time for a long document. You may want to set Acrobat to deliver only the currently visible page so that it analyzes only a small piece of the document at a time. This consideration will vary depending on the size and complexity of the document and on the features of the screen reader. When Acrobat delivers information to a screen reader, screen magnifier, or other assistive software, it loads information into a memory buffer that is directly available to the assistive software. The amount of information that is delivered to the memory buffer can affect how long Acrobat takes to perform tasks, such as opening the document, advancing to the next page, changing views, and carrying out commands. • Only Read The Currently Visible Pages This option is usually best when you use a screen magnifier. It improves performance by eliminating the need for the software to process parts of the document that aren't visible. When Acrobat sends only the currently visible pages of a PDF to the memory buffer, the assistive technology has access to those pages only. It cannot go to another page until the next page is visible and Acrobat has sent the page information to the memory buffer. Therefore, if this option is selected, you must use the navigation features of Acrobat, not those of the assistive technology, to navigate from page to page in the document. You should also set the Default Page Layout option in preferences to Single Page if you choose to have Acrobat send only the currently visible pages to the assistive technology. Because Acrobat sends page information about all visible pages, the assistive technology receives information about pages that may be only partially visible (such as the bottom of one page or the top of the next), as well as those pages that are completely visible. If you use a page display setting other than Single Page, such as Continuous, and then you display the next page, the technology may not correctly track which portion of a previous page it has already read aloud. For instructions on setting the default page layout to Single Page, see "Prefer­ ences for viewing PDFs" on page 33. This option corresponds to the Only Read The Currently Visible Pages option in the Accessibility Setup Assistant. • Read The Entire Document This option can be best if you use a screen reader that has its own navigation and search tools and that is more familiar to you than the tools in Acrobat. This option corresponds to the Read The Entire Document At Once option in the Accessibility Setup Assistant. • For Large Documents, Only Read The Currently Visible Pages This option is selected by default and is usually best if you use a screen reader with long or complex PDFs. It allows Acrobat to deliver an entire small document but revert to page-by-page delivery for large documents. This preference corresponds to the For Large Documents, Only Read The Currently Visible Pages option in the Accessibility Setup Assistant. Confirm Before Tagging Documents When selected, lets the user confirm the options that will be used before Acrobat prepares an untagged document for reading. Tagging can be a time-consuming procedure, especially for larger documents. This preference corresponds to the Confirm Before Tagging Documents option in the Accessi­ bility Setup Assistant. Read Out Loud Options Set preferences in this section to control volume, speed, and pitch of the voice used for Read Out Loud. You can choose to use the default voice or any of the voices provided by your operating system. Select Read Form Fields to have Read Out Loud read the contents of form fields. These preferences don't correspond to options in the Accessibility Setup Assistant.