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https://issues.apache.org/jira/browse/PDFBOX-4276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-4276.
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Resolution: Fixed
> 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: 1.8.15, 2.0.11, 3.0.0 PDFBox
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> 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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