[PDFBOX-4886] Regression: Images get blurry when rendering with 304 DPI (works fine with 2.0.19)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.0.20
• Component/s: Rendering
• Assignee: Tilman Hausherr
• Reporter: Emmeran Seehuber
• Created: 15/Jun/20 13:39
• Updated: 17/Jun/20 06:40
• Resolved: 17/Jun/20 06:40

Description

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.

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.

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...

 

Issue Links

• duplicates: PDFBOX-4863 Bitmapped fonts are rendered very blurry