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https://issues.apache.org/jira/browse/PDFBOX-1711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13755457#comment-13755457
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Andreas Lehmkühler edited comment on PDFBOX-1711 at 8/31/13 8:05 AM:
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The pdf contains group XObjects a special type of form XObjects which are 
currently not supported.

BTW: thanks for the simple example which will make it (hopefully) easier to 
implement the missing feature. :-)
                
      was (Author: lehmi):
    The pdf contains group XObjects a special type of form XObjects which are 
currently not supported
                  
> Loss of colour precision in exporting PDF to image
> --------------------------------------------------
>
>                 Key: PDFBOX-1711
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1711
>             Project: PDFBox
>          Issue Type: New Feature
>    Affects Versions: 1.8.2
>            Reporter: Dave Sowerby
>         Attachments: input.pdf, output.png
>
>
> In attempting to convert a PDF which makes use of CMYK colours as well as 
> colour transparencies, but the output I'm seeing doesn't match the input.  
> I'm using the command line PDFToImage and have output in a lossless format 
> and attempted to use all potential color depths to see if I can find a 
> workable option.  

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