Emmeran Seehuber created PDFBOX-4886:
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Summary: Regression: Images get blurry when rendering with 304 DPI
(works fine with 2.0.19)
Key: PDFBOX-4886
URL: https://issues.apache.org/jira/browse/PDFBOX-4886
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.20
Reporter: Emmeran Seehuber
Attachments: FlowerBompA6.pdf, image-2020-06-15-15-29-32-611.png,
image-2020-06-15-15-29-33-208.png
There seems to be a regression when rendering a PDF to an high DPI image with
PDFBox 2.0.20. Everything worked fine with PDFBox 2.0.19.
See the attached [^FlowerBompA6.pdf] file. The rendering is done using
{{}}{{PDFRenderer pdfRenderer = new PDFRenderer(doc);}}
{{BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(0, 304,
ImageType.RGB);}}
I've build a small project to reproduce this problem:
[https://github.com/rototor/pdfbox-render-blurry]
Checkout this repository and run mvn clean test. You find a blurry rendering of
the PDF as result in the target/test folder.
!image-2020-06-15-15-29-32-611.png!
Then change the PDFBox Version in the pom.xml to 2.0.19 and run mvn clean test
again.
The rendering of the flowers are now sharp.
!image-2020-06-15-15-29-33-208.png!
A test driver in a project of mine compares the resulting file sizes after
exporting the image as JPGs. Because of the blurring the resulting file is way
smaller then it used to be...
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