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https://issues.apache.org/jira/browse/PDFBOX-5870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17874891#comment-17874891
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Tilman Hausherr commented on PDFBOX-5870:
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Could you attach a PDF where this happens?

> [PATCH] Detect CMYK image without relying on metadata
> -----------------------------------------------------
>
>                 Key: PDFBOX-5870
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5870
>             Project: PDFBox
>          Issue Type: Bug
>            Reporter: Simon Steiner
>            Priority: Major
>         Attachments: tmp.patch
>
>
> If getNumChannels returns empty string we should use a different system to 
> detect a cmyk image, so the output image is not inverted



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