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https://issues.apache.org/jira/browse/PDFBOX-2423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14262700#comment-14262700
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Tilman Hausherr commented on PDFBOX-2423:
-----------------------------------------

Here the list of what's left that I believe is related to this issue:
- gs-bugzilla690467.pdf: two vertical stripes missing
- eci_altona-test-suite-v2_technical_H.pdf: two stripes different
- gs-bugzilla694585.pdf: stuff not at the correct place
- K_UPMEYER_SPRING10.pdf: canvas missing around "tips and tricks"
- PDFBOX-994.pdf: two rectangles missing
- PDFBOX-1058.pdf: page 1 ball missing, page 4 too, plus stuff at wrong place
- PDFBOX-1577: "blurry shadow" missing
- PDFBOX-2103.pdf: canvas missing
- PDFBOX-2182.pdf: gradient effect missing

gs-bugzilla690467.pdf ( http://bugs.ghostscript.com/show_bug.cgi?id=690467 ) 
might be a good start, because this file is very short.

> Page tree handling needs rewriting
> ----------------------------------
>
>                 Key: PDFBOX-2423
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2423
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: PDModel
>    Affects Versions: 1.8.7, 2.0.0
>            Reporter: John Hewson
>            Assignee: John Hewson
>            Priority: Blocker
>             Fix For: 2.0.0
>
>         Attachments: 025957.pdf, 26101_Colors.ai-1.png, 
> 26101_Colors.ai-1.png-diff.png, Basiswissen-Vorschriften.pdf-3.png, 
> Basiswissen-Vorschriften.pdf-3.png-diff.png, 
> Basiswissen-Vorschriften.pdf-4.png, 
> Basiswissen-Vorschriften.pdf-4.png-diff.png, PDFBOX-1058.pdf-1.png, 
> PDFBOX-1058.pdf-1.png-diff.png, PDFBOX-1058.pdf-4.png, 
> PDFBOX-1058.pdf-4.png-diff.png, PDFBOX-1094-tiling_pattern.pdf, 
> PDFBOX-1711-cmyk.pdf-1.png, PDFBOX-1711-cmyk.pdf-1.png-diff.png, 
> PDFBOX-1794-vattenfall.pdf-1.png, PDFBOX-1794-vattenfall.pdf-1.png-diff.png, 
> PDFBOX-1917.pdf-1.png, PDFBOX-1917.pdf-1.png-diff.png, 
> asy-functionshading.pdf-1.png, asy-functionshading.pdf-1.png-diff.png, 
> bugzilla869140.pdf, example_026.pdf-1.png, gs-bugzilla694385.pdf, 
> jagpdf_doc_patterns.pdf
>
>
> The way in which PDFBox handles the Page tree needs to be rewritten, 
> preferably from scratch. Currently the document catalog returns the raw 
> objects from the page tree, wrapped in either a PDPage or PDPageNode.
> We need to abstract over the page tree and get rid of PDPageNode, we should 
> provide methods which can add/remove PDPage objects *only*. The existing 
> low-level access to the page tree is not needed at the PD-level.
> Inheritance of page properties such as crop box, resources, and rotation 
> should be reimplemented to use whatever new page tree abstraction we invent. 
> We can finally remove the old broken methods which didn't look up the 
> inheritance tree when retrieving these values.



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