Tilman Hausherr commented on PDFBOX-4141:

What is the meaning of the table columns? Convert code to the left into code to 
the right? But in your table, there is the line "0020,Missing". 0x20 is a 
space. You don't want us to optionally remove the space, do you?

I'm also wondering whether it is always the right thing to convert or remove 
such codes. If such a code is between two words, then wouldn't it be better to 
replace it with a space? If an application just wants to extract words, then 
the conversion wouldn't be needed at all, such characters would count as 

> Suppress control characters?
> ----------------------------
>                 Key: PDFBOX-4141
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4141
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Parsing
>            Reporter: Andreas Meier
>            Priority: Minor
>         Attachments: Mapping_default_to_adobe.csv, Test_with_MW.pdf, 
> Test_with_MW.txt, Test_with_MW_AdobeReader_export.txt, 
> Test_with_MW_linux.jpg, Test_without_MW.txt
> At the moment pdfbox extracts all types of characters.
> Therefore control characters that occur will also be extracted.
> Unfortunately some of these control characters might deform text.
> For example 'MESSAGE WAITING' (U+0095) [MW]
> I attached some files and a screenshot how text is printed when MESSAGE 
> WAITING is present.
> Should PDFBox handle this type of characters? Maybe suppress them in 
> PDFTextStripper?
> I know that PDFBox works correctly in this case, a feature to turn off or 
> suppress special characters might produce better output than the default 
> Setting unless some control characters are used for any further processing!?
> Feedback appreciated.
> What other programs do:
> a) ignore control characters (Okular PDF Viewer - KDE)
> b) exchange them  (Adobe Reader wrote a dot "." in place of MW)
> Regards
> Andreas

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