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https://issues.apache.org/jira/browse/PDFBOX-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16467351#comment-16467351
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Aleksandar Putnik commented on PDFBOX-4210:
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We are using Tesseract for text recognition. In case of PDF, we need to convert
it to an image first.
So, what you are saying is, that in this case, it's just a poorly constructed
PDF and some tools which can read it are actually using some other ways
(probably OCR).
Thanks for the clarification.
> Unable to extract the text from a PDF ("No Unicode mapping.." warnings)
> -----------------------------------------------------------------------
>
> Key: PDFBOX-4210
> URL: https://issues.apache.org/jira/browse/PDFBOX-4210
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 2.0.9
> Reporter: Aleksandar Putnik
> Priority: Major
> Attachments: Testdokument.pdf
>
>
> I'm using Tika (v1.18 , which means pdfbox 2.0.9) to extract the text from
> PDF.
> I have a document from which the Acrobat Reader (Adobe Acrobat Reader DC) can
> extract the text (although not with a 100% precision).
> Besides warnings "WARNING: No Unicode mapping for ... in font ArialMT" pdfbox
> 2.0.9 doesn't return anything.
> As you can see from the warning, the font in question is ArialMT. It is
> custom encoding and the pdf doesn't include toUnicode mapping. Font type is
> CID TrueType (this info is provided by "pdffonts")
> "pdftotext" also can't extract anything but only shows an error `Syntax
> Error: Unknown character collection 'Adobe-ArialMT'`
> The pdf producer (used by the customer) is VintaSoft PDF .NET Plug-in v5.5.
> I would like to determine whether there is a bug in pdfbox or the pdf
> producer has to adjust and improve the "readability" of pdf.
>
>
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