[PDFBOX-4918] PDFRenderer.renderImageWithDPI DPI parameter ignored in 2.0.20

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.0.20
• Component/s: Rendering
• Environment: x64 windows. several 64-bit Java 8 JREs
• Flags: Important
• Assignee: Unassigned
• Reporter: chris laws
• Created: 18/Jul/20 00:01
• Updated: 19/Jul/20 19:05
• Resolved: 18/Jul/20 04:19

Description

org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI method no longer correctly renders pixels in a raster graphic PDF at the resolution requested.

PDFRenderer pdfRenderer = new PDFRenderer(PDDocument.load(new File("sample_bilevel_raster.pdf")));
BufferedImage bi = pdfRenderer.renderImageWithDPI(0, 300, ImageType.RGB);
javax.imageio.ImageIO.write(bim, "PNG", new File("my png filename));

I tested this with all Pdfbox 2 releases (2.0.0 - 2.0.20) and found this bug only affecting 2.0.20. 2.0.0-2.0.19 produced correct output.

it appears v20 renders onto a destination image of the correct size but the source image is set at 72 DPI causing the destination pixels to be extrapolated gray-scale.

This is reproducible with any bi-level raster PDF I used. See attached input and output files.

 

 

Issue Links

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