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https://issues.apache.org/jira/browse/PDFBOX-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13684185#comment-13684185
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james king commented on PDFBOX-1623:
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Hidden text means the text in the pdf is transparent. in the example file, 
there is a lot "1000" which i don't want to extract from the pdf.
                
> Can't detect hidden text on pdf page
> ------------------------------------
>
>                 Key: PDFBOX-1623
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1623
>             Project: PDFBox
>          Issue Type: Wish
>          Components: Text extraction
>    Affects Versions: 1.8.1
>         Environment: windows java7
>            Reporter: james king
>         Attachments: test_hidden_text.pdf
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> I trying to extract the text from the page , but it extract the hidden text 
> also which i don't need. How can i detect it is hidden or not? Because in 
> normal case the hidden text is the user don't want to extract!

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