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https://issues.apache.org/jira/browse/PDFBOX-1868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883239#comment-13883239
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Tilman Hausherr commented on PDFBOX-1868:
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The effect appears with the version 1.8.5 (which is the upcoming 1.8.4 version)
and the effect happens. It happens also with the pdfbox-app.jar. The effect
does not happen with the unreleased 2.0 version. I think that your problem is
related to PDFBOX-1435. I see that the solution isn't used for 1.8.x. Now you
could either use the 2.0 version by building it from svn repository (that
version is pretty good!), or look at the code and move it to your 1.8 source,
or use the Sun code I mention there to change calculatePath() in
TTFGlyph2D.java (might be tricky if you distribute the end product).
> Garbled / distorted fonts during PDF to image conversion on recent versions
> ---------------------------------------------------------------------------
>
> Key: PDFBOX-1868
> URL: https://issues.apache.org/jira/browse/PDFBOX-1868
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 1.8.3
> Environment: Java 6
> Reporter: Jon Wu
> Attachments: script-font-bad-1.8.3.png, script-font-good-1.6.0.png,
> script-font.pdf
>
>
> Rasterized fonts have distorted curves and weird breaks in the letter when
> converting PDF to image.
> I'm running PDFBox in a web server environment to rasterize PDFs with text in
> them. However, I've found that in recent versions, I end up getting garbled
> text using the same code, same PDF, and same machine.
> In script-font-bad-1.8.3.png, you can see that this big cursive F has a weird
> break in it in the middle and all the curves aren't smooth which is really
> obvious when you compare this bad image (1.8.3) with the PDF or a good one
> (1.6.0).
> See script-font-good-1.6.0.png or the attached PDF for the correct rendering.
> What's weird is that I don't get the bad image when I use pdfbox-app.jar on
> the PDF - it's only with my code. The PDF has an embedded TrueType (CID) font
> with Identity-H encoding and was written by iText.
> This also happens on other fonts, but I chose this example because it's most
> obvious.
> Good versions:
> 1.6.0 (I'm on this now)
> 1.7.0-SNAPSHOT from approx 10/24/11
> 1.8.0-20130225.201137-98
> Bad versions:
> 1.7.1
> 1.8.0-SNAPSHOT from approx 3/1/13
> 1.8.3
> and many others in between
> I ended up downgrading to 1.6.0 because I had some issues with transparency
> on some of the good snapshots that were working, but I think the transparency
> issues are resolved on 1.8.3.
> Tilman Hausherr mentioned this could be a regression of PDFBOX-1435.
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