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https://issues.apache.org/jira/browse/PDFBOX-1871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14316993#comment-14316993
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Tilman Hausherr commented on PDFBOX-1871:
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I don't see any difference?! Also not for the file mentioned by Jon. Not really
surprising, because the effect that Jon describes gets more with high
resolutions, while your fix is about 1px only.
> Content appears a few px higher when rasterizing PDF
> ----------------------------------------------------
>
> Key: PDFBOX-1871
> URL: https://issues.apache.org/jira/browse/PDFBOX-1871
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 1.8.3
> Reporter: Jon Wu
> Fix For: 2.0.0
>
> Attachments: PDFBOX-1871_unc.pdf,
> test-text-alignment-textbox-PDF2IMG-300dpi.png,
> test-text-alignment-textbox-PDFBox-1.8.3-300dpi.png,
> test-text-alignment-textbox.pdf
>
>
> PDFBox seems to be off by a little bit vertically when you rasterize a PDF.
> This is in comparison to both Adobe's PDF library and many other PDF viewers
> such as Chrome's and the one in OS X.
> I've attached an example PDF where there's some text with a green rectangle
> around it. The rectangle is has about 2x as much space above it compared to
> below it, but in PDFBox's raster, the rectangle is closer to the top than is
> is to the bottom.
> This is obvious at 300 dpi but at 96 dpi it's hard to tell for sure.
> Anecdotally, I've noticed that when rendering text at about 74 dpi, PDFBox
> seems to be off by about 1px.
> I've attached both a PDFBox raster and one made with Adobe's PDF library for
> comparison.
> java -jar pdfbox-app-1.8.3.jar PDFToImage -imageType PNG -resolution 300
> -color rgba test-text-alignment-textbox.pdf
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