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https://issues.apache.org/jira/browse/PDFBOX-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025040#comment-13025040
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Emil Wacker commented on PDFBOX-1001:
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I did some analysis on a set of PDFs and ruled out the following as the cause:
creator/producer, Font subtype (e.g. Type1 vs TrueType), Font firstChar != 32.
Also not a factor is whether or not Debug shows readable text on the "Tj" lines
in the stream items.
> TextPosition.getHeight() returns erroneous value for some PDFs
> --------------------------------------------------------------
>
> Key: PDFBOX-1001
> URL: https://issues.apache.org/jira/browse/PDFBOX-1001
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 1.4.0, 1.5.0
> Environment: Solaris, WinXP
> Reporter: Emil Wacker
>
> For a PDF that worked fine under 1.2.1 the height value returned is negative
> and the wrong value (i.e. using Math.abs() won't fix it). Other PDFs work
> fine.
> PDF Debug shows "Creator:Crystal Reports" and "Producer:PDF-XChange
> (XCPRO30.DLL v3.30.0064) (Windows 2k)"
> And when examining the 'Stream' items, the text is not what displays.
> Any suggestions on what to look for so that I can do differential analysis
> against other PDFs to see what they do/not have in common with this one?
> (It's client data so I can't post the PDF. )
> It's stopping us from moving off 1.2.1 (and later versions fix another issue
> we have of seeing question marks instead of the actual characters).
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