[gs-bugs] [Bug 692588] New: Some watermarked PDF files are rasterized when converting to PDF/A - #1524

[bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=692588

           Summary: Some watermarked PDF files are rasterized when
                    converting to PDF/A - #1524
           Product: Ghostscript
           Version: 9.04
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: minor
          Priority: P4
         Component: PDF Writer
        AssignedTo: ken.sharp at artifex.com
        ReportedBy: jritmeijer at gmail.com
         QAContact: gs-bugs at ghostscript.com


Perhaps not necessarily a bug, more a question.

I am working on a solution that uses Ghostscript to post process PDF files in
order to convert them to PDF/A. This works quite well, but occasionally the
resulting PDF/A file is rasterized.

I assume this is because the source file contains some kind of content that can
not be expressed in PDF/A unless an image is used. 

I have done some tests to get a feeling what is causing a page to be
rasterized, but I'd like to get a definitive list so I can document it.

No rasterisation
- Text Rotation
- Overlapped text

Rasterization
- Text (or any object) using transparency.
- The addition of any image, see attached file.

So my question is: What determines if a page is rasterized when converting to
PDF/A?

Attached are the following files:
* SourcePDF-ImageWatermarked.pdf: A simple PDF file that contains an image. The
source of the image is a JPG file.
* PDFA-ImageWatermarked.pdf: The same file after converting to PDF/A. Note that
it has been rasterized.
* Source-Form.PDF: A PDF file of a form before conversion. Very basic, no
images
* PDFA-Form.PDF: The same form after conversion to PDF/A. It is not clear to me
why this is rasterized.

My PDF/A GS Command line options and definition file are as per bug #692587

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