On Aug 11, 2014, at 20:40, Harper Lists, Alan wrote: > Paula. I have always found this to be the case—Acrobat and Acrobat Reader can > find word breaks that Skim and other apps that use Apple's software cannot. > Try opening your pdfs in Preview and seeing if you get the same behavior as > in Skim—I bet you will. Perhaps someone can comment on why this is the case. > I have been able to fix the problem by re-OCR'ing the document, but mostly I > just live with the annoyance.
The problem is that PDF is not a text format, it's a graphics format. It contains characters, but it may or may not contain the invisible characters like spaces. I think Apple's PDFKit only collects the characters as they are contained in the PDF, while Acrobat also tries to guess missing spaces based on the placement of the characters. So whether you will get or don't get the spaces doesn't depend on time, but on the PDF (some PDFs do contain the spaces, some don't.) OCR can fix that by rescanning the graphics to include a new text layer, including the spaces. But Apple currently does not provide any OCR functionality in its frameworks. Christiaan
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