How PDF is different from PostScript, how to identify key parts of PDF source code, layout problems, verbosity, flattening and mojibake.
Acrobat
Preview offers PDF/A as an export option, intended for PDFs that are to be relied on long into the future, for archives. Do they comply with one of the PDF/A standards, though?
Annotations are complicated. If you’re not careful, hidden annotations can be left in documents and cause embarrassment. And how to recover a PDF that Preview has mutilated.
New ‘marks’, lightweight bookmarks to make navigating large documents easier. They aren’t written out to the PDF document, though, leaving it intact.
We often need to compare two documents, such as legal agreements or revisions of a report. How can we do this if they’re PDFs?
Preview now offers a tool to redact content from PDF documents. It’s simple to use, but is it safe, or could it lead to disclosure of sensitive information?
Looks at plain text, CSV, XML, JSON, RTF, RTFD, .docx, .xlsx, and PDF. Which should you trust with your important documents in archives?
This PDF contained 161 scanned pages from a book, but not one word could be accessed as text, despite using OCR on them. What can you do?
A great idea: tag blocks of text in a PDF and build them into reading order, so that they can be read out loud. How well does that work, then?
Open a PDF document, select a URL within it and Copy. Then paste it into a webpage for publication. Simple – but the URL then broke. Why?
The Eclectic Light Company 