chris laws created PDFBOX-4918:
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Summary: PDFRenderer.renderImageWithDPI DPI parameter ignored in
2.0.20
Key: PDFBOX-4918
URL: https://issues.apache.org/jira/browse/PDFBOX-4918
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.20
Environment: x64 windows. several 64-bit Java 8 JREs
Reporter: chris laws
Attachments: 2.0.0.png, 2.0.1.png, 2.0.10.png, 2.0.11.png, 2.0.12.png,
2.0.13.png, 2.0.14.png, 2.0.15.png, 2.0.16.png, 2.0.17.png, 2.0.18.png,
2.0.19.png, 2.0.2.png, 2.0.20.png, 2.0.3.png, 2.0.4.png, 2.0.5.png, 2.0.6.png,
2.0.7.png, 2.0.8.png, 2.0.9.png, sample_bilevel_raster.pdf
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.
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