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https://issues.apache.org/jira/browse/PDFBOX-3600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15704541#comment-15704541
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Tilman Hausherr commented on PDFBOX-3600:
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Maybe the answer landed in your spam folder.
"how to" questions are really for the user mailing list or for stackoverflow. I
should not even respond here :-)
preflight isn't what you want, that is for PDF/A checking.
Your original strategy (other issue) is ok, if you also take the images into
consideration.
Alternatively, convert the PDFs to images (see sample code in stackoverflow),
and then evaluate what colors are in the images.
> How to use Preflight component to get PDF's colorspace
> ------------------------------------------------------
>
> Key: PDFBOX-3600
> URL: https://issues.apache.org/jira/browse/PDFBOX-3600
> Project: PDFBox
> Issue Type: Wish
> Components: Preflight
> Reporter: Yan Bing
> Assignee: Andreas Lehmkühler
> Priority: Critical
>
> I want to get a PDF's color property before sending it to Color-printer or
> Monochrome-Only printer in my program.
> But I don't know how to implement this by Preflight component.
> No samples can be found anywhere.
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