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https://issues.apache.org/jira/browse/PDFBOX-4317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617163#comment-16617163
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CAP commented on PDFBOX-4317:
-----------------------------
The stream itself and the contained data seem to be absolutely valid -
regenerating the original Jpeg has been possible in all my experiments. The
stream itself must therefore be "complete". However some additional PDF
specific information might be missing from the stream, as the stream itself
shall contain some extra information needed to identify the JPEG's progressive
encoding. (assumption based on the reference manual)
I think that without this information Adobe Reader (and similar programs) might
default to treating the JPEG as a baseline JPEG image (which might explain the
failure displaying the stream).
Adobe DC is no big help in generating a "valid" progressive JPEG stream for
comparison, as they avoid adding progressive JPEG images to PDFs altogether.
They will convert any progressive JPEG images to baseline JPEGs (maybe to evade
the whole problem).
For sure Adobe does not care much about adding progressive JPEG images to PDFs
at all. According to
*hint 5 in chapter 7.4.8:*
_"There is no benefit to using progressive JPEG for stream data that is
embedded in a PDF file. Decoding progressive JPEG is slower and consumes more
memory than baseline JPEG. The purpose of this feature is to enable a stream to
refer to an external file whose data happens to be already encoded in
progressive JPEG."_
*Adobe's standard answer:*
Adobe told the customer to ask the "creator of the PDF file" for help. They
don't see any reason to fix it, as they are claiming, that the stream is
incomplete and must be fixed in the producing application. Entirely possible
and they might be correct about that - but still... Other applications are
indeed capable of displaying the Image (/reading the erroneous stream).
> Some feature of the given JPEG leads to erroneous results, when adding
> (drawing) it to a PDPageContentStream.
> -------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-4317
> URL: https://issues.apache.org/jira/browse/PDFBOX-4317
> Project: PDFBox
> Issue Type: Bug
> Components: Writing
> Affects Versions: 2.0.9
> Reporter: CAP
> Priority: Major
> Attachments: IMG-20180719-WA0000.jpg, UsingAdobeDC.pdf,
> image-2018-09-14-09-13-56-216.png, image-2018-09-14-09-14-45-358.png,
> image-2018-09-14-09-15-40-860.png, out.pdf
>
>
> Some feature of the given JPEG leads to erroneous results, when adding
> (drawing) it to a PDPageContentStream.
> The document itself is created just fine and the page is displayable in the
> "PDF Debugger" application, but for example the Adobe Reader is reporting an
> "internal Error", when opening the created PDF.
> Reproducable via:
> {code:java}
> try(PDDocument document = new PDDocument()){
> PDPage page = new PDPage();
> try(PDPageContentStream pcs = new PDPageContentStream(document, page)){
> PDImageXObject pdImage = PDImageXObject.createFromFile("path to jpeg",
> document);
> pcs.drawImage(pdImage, 30, 30);
> }
> document.addPage(page);
> document.save(new File("output file"));
> }{code}
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