[jira] [Resolved] (PDFBOX-4276) Multiply blend mode not detected

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-4276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr resolved PDFBOX-4276.
-------------------------------------
    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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