Jon Wu created PDFBOX-1871:
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Summary: 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
Affects Versions: 1.8.3
Reporter: Jon Wu
Attachments: 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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