Re: [pdf-devel] FS#72 jpx filter implementation

[Jose E . Marchesi]

    g> Well, I found that Second Life and a GIMP plugin uses OpenJPEG but
    g> Jasper's website lists many more projects. If you can, please do a
    g> more detailed research and post further comments here, I would
    g> appreciate it.
    
    I know that MuPDF and GhostScript recently switched over.  I'm sure I
    remember some more list discussions as well.

I had a talk with some Ghostscript developers.  They are still
investigating and the decision is still pending.  I would suggest to
wait for their decision and, probably, follow it.

Gerel, if you gree with my suggestion, please add a note to the task
in flyspray explaining why it is being put on hold.

<Robin_Watts> GS hasn't swapped from jasper to openjpeg - at least not
              yet.
<jemarch> I noticed that there is a openjpeg branch.  It was not
          merged yet then..
<rillian> openjpeg is a smaller code base, and seems to have some
          momentum for distribution support
<rillian> on the other hand, openjpeg is missing some JPX and
          PDF-specific features needed for a full implementation
<jemarch> So it will need patching as well, right?
<rillian> correct
<rillian> we're still making up our mind which to spend time
          on
<jemarch> rillian: are the PDF-specific features deviating
          from the JPEG2000 spec?
<rillian> jemarch: the only case I'm aware of is with an
          /ColorSpace /Indexed in the image dict
<rillian> in pdf the /ColorSpace in the image dict overrides
          the colour space in JPX stream, and in the case of
          a paletted image, this means the pdf interpreter
          must have access to the raw sample values before
          the JPX decoder expands them with the included
          palette
<rillian> this is not difficult to add
<rillian> the larger portion of the work needed for openjpeg
          had to do with missing JPEG 2000 features, like yuv
          and cmyk support

--
Jose E. Marchesi  <address@hidden>
                  http://www.jemarch.net
GNU Project       http://www.gnu.org