Tilman Hausherr created PDFBOX-4276:
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Summary: Multiply blend mode not detected
Key: PDFBOX-4276
URL: https://issues.apache.org/jira/browse/PDFBOX-4276
Project: PDFBox
Issue Type: Bug
Components: Preflight
Affects Versions: 2.0.11, 1.8.15, 3.0.0 PDFBox
Reporter: Tilman Hausherr
Assignee: Tilman Hausherr
Fix For: 1.8.16, 2.0.12, 3.0.0 PDFBox
Attachments: sample_processed.pdf
The attached file should fail the PDF/A-1b check but doesn't. VeraPDF detects
the incorrect blendmode at {{Root/Pages/Kids/[0]/Resources/ExtGState/R9/BM}}:
"The following keys, if present in an ExtGState object, shall have the values
shown: BM - Normal or Compatible".
The cause is that in
{{ExtGStateValidationProcess.extractExtGStateDictionaries()}} there is a check
that the name of the ExtGState matches "(GS|gs)([0-9])+". This has been since
the beginning as an Apache project (PDFBOX-1056) and even since the first
commit on github ([https://github.com/gbm-bailleul/padaf]) in 2010.
I could ask but I don't think that they would know why that decision was made
over 8 years ago. My guess is that some code from elsewhere was reused.
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