[PDFBOX-4519] Reduce artefacts in shadings

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.15
• Fix Version/s: 2.0.16, 3.0.0 PDFBox
• Component/s: Rendering
• Labels: shading shadingpattern
• External issue URL: http://bugs.ghostscript.com/show_bug.cgi?id=219588
• Assignee: Tilman Hausherr
• Reporter: Tilman Hausherr
• Created: 18/Apr/19 19:21
• Updated: 28/Jun/19 04:39
• Resolved: 19/Apr/19 04:06

Description

Many PDFs with shadings, e.g. the frog of Kerstin Upmeyer have a few white dots. In the linked GS issue, Raph Levien mentions rounding problems with the triangles and suggested to "fatten" them. I do this by drawing an interpolation-colored line and it works nicely.