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https://issues.apache.org/jira/browse/PDFBOX-1868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13884004#comment-13884004
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Andreas Lehmkühler commented on PDFBOX-1868:
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PDFBOX-1435 consists of 2 fixes. The first one for the pixelmap issue doesn't
make sense here, as the pdf hasn't any pixelmap. And the second one relates to
PDFBOX-490 which won't be backported.
I had a look at the bad result image and I'm still wondering why the big "F" is
rendered wrong and the small one isn't. Both texts are using the very same
font. Furthermore I can't agree with Jon, I always got bad results when using
PDFBox versions 1.7.0 up to 1.8.3. Only 1.6.0 and the trunk work fine. I didn't
check that but maybe this issue is again JDK related?
[~jon_wu] Do you use different JDK versions when running PDFBox within your
Webserver and on the command line?
> 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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