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https://issues.apache.org/jira/browse/PDFBOX-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291019#comment-14291019
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Tilman Hausherr commented on PDFBOX-2530:
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I've added a bit about this in the top part, i.e. get the code to build and
read the PDF specification. Btw, as a warning of sorts, I had three
applications for my 2014 project which required unusual skills. This one
doesn't (except know about Java GUI, and not be scared by the size of the PDF
specification), so don't concentrate on a single GSoC project :-)
> Improve PDFDebugger
> -------------------
>
> Key: PDFBOX-2530
> URL: https://issues.apache.org/jira/browse/PDFBOX-2530
> Project: PDFBox
> Issue Type: Improvement
> Components: Utilities
> Affects Versions: 1.8.8, 2.0.0
> Reporter: Tilman Hausherr
> Labels: gsoc2015
>
> (This is an idea for [GSOC2015|https://www.google-melange.com/]. But if you
> want to submit some improvements to the code outside of GSOC2015 now, this is
> fine. We can always come up with other project ideas for GSOC2015)
> Our command line utility PDFDebugger (part of the command line pdfbox-app get
> it [here|https://pdfbox.apache.org/downloads.html], read description
> [here|https://pdfbox.apache.org/commandline/], see the source code
> [here|https://svn.apache.org/viewvc/pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/PDFDebugger.java?view=markup&sortby=date])
> needs some improvements:
> - hex view
> - view of non printable characters
> - saving streams
> - binary copy & paste
> - ability to search in streams (very useful for content streams and meta
> data)
> - show images that are streams
> - show PDIndexed color lookup table, show the index value, the base and
> RGB color value sets when the mouse moves
> - show PDSeparation color
> - show PDDeviceN colors
> - show font encodings and characters
> - edit attributes
> - edit streams, while keeping or changing the compression filter
> - save altered PDF
> - color mark of certain PDF operators, especially Q...q and text operators
> (BT...ET). Ideally, it should help the user understand the "bracketing" of
> these operators, i.e. understand where a sequence starts and where it ends.
> (See "operator summary" in the PDF Spec) Other "important" operators I can
> think of are the matrix, font and color operators. A cool advanced thing
> would be to show the current color or the font in a popup when hovering above
> such an operator.
> To see a product with a similar purpose that is better than PDFDebugger,
> watch [this video|https://www.youtube.com/watch?v=g-QcU9B4qMc].
> I'm not asking to implement a clone of that product (I don't use it, all I
> know is that video), but we at PDFBox really need something that makes PDF
> debugging easier. As an example of how the current PDFDebugger prevented me
> from finding a bug quickly, see PDFBOX-2401 and search for "PDFDebugger".
> Prerequisites:
> - java programming, especially the GUI components
> - the ability to understand existing source code
> Using external software components is possible (must have Apache License or a
> compatible one), but should be decided on a case-by-case basis, we don't want
> to get too big.
> Development strategy: go from the easy to the difficult. The wished features
> are already sorted this way (mostly).
> Get introduced: [download the source code with
> svn|https://pdfbox.apache.org/downloads.html#scm] and build it with maven.
> Run PDFDebugger and view some PDFs to see the components of a PDF. Start with
> the file of PDFBOX-2401. Read up something about the structure of PDF on the
> web or from the [PDF
> Specification|https://www.adobe.com/devnet/pdf/pdf_reference.html].
> Mentor: Tilman Hausherr (European timezone, languages: german, english,
> french). To see the GSoC2014 project I mentored, go to PDFBOX-1915.
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