[PDFBOX-4863] Bitmapped fonts are rendered very blurry

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.20
• Fix Version/s: 2.0.21, 3.0.0 PDFBox
• Component/s: Rendering
• Labels: regression
• Flags: Patch, Important
• Assignee: Tilman Hausherr
• Reporter: Cornelis Hoeflake
• Created: 08/Jun/20 19:33
• Updated: 21/Aug/20 04:54
• Resolved: 20/Jun/20 10:51

Description

Since 2.0.20 we have rendering issues for PDF's with bitmapped fonts. Please see attached images, the 2.0.19 and 2.0.20 version. Both are rendered from a A4 PDF on 300 DPI. Font size is around 12 points I think.

A PDF with the problem and a diff image is attached.

I think it is related to PDFBOX-4516 (which is generally a great improvement).

Issue Links

• is duplicated by: PDFBOX-4917 Images are blurry after updating to 2.0.20
• is duplicated by: PDFBOX-4886 Regression: Images get blurry when rendering with 304 DPI (works fine with 2.0.19)
• is duplicated by: PDFBOX-4918 PDFRenderer.renderImageWithDPI DPI parameter ignored in 2.0.20
• relates to: PDFBOX-4516 PDFBox text and images are blurry even after rendering with high DPI