Even, Thank you for telling me the reason why GDAL does not support Jasper for reading a NITF file and how to hack that. How about writing (instead of reading) a Jasper compressed image into NITF?
I want to be able to write out not read in a JPG2000 compressed NITF file. (My input image is a 16bit raw image). Why GDAL does not support writing a Jasper compressed image into NITF? How to hack that? Thanks. Mo --- On Sat, 3/28/09, Even Rouault <even.roua...@mines-paris.org> wrote: > From: Even Rouault <even.roua...@mines-paris.org> > Subject: Re: [gdal-dev] Is it a big thing to change ECW to support 16-bit > imagery? > To: gdal-dev@lists.osgeo.org > Cc: "mohwawang" <mohwaw...@yahoo.com> > Date: Saturday, March 28, 2009, 9:36 AM > > -----Inline Attachment Follows----- > > Mo, > > NITF driver cannot use Jasper for reading JPEG2000 > compressed NITF images, > because Jasper doesn't support decoding an image that is > located at an > arbitrary offset inside a file. (At least, that's the first > reason why it > can't work.). I imagine that if you badly want to use > Japser, you could hack > the NITF driver so that it writes a temporary image with > just the JPEG200 > content and pass it to the Jasper driver. > > Even > > Le Saturday 28 March 2009 14:19:42 mohwawang, vous avez > écrit : > > Ivan, > > > > It seems that both you and me guess that it is a big > thing to change the > > source code of ECW SDK to support 16bit imagery. > > > > So, forget about ECW. How about another jpeg2000 > package, Jasper, which > > (1)supports 8bit and 16bit and (2)is an open source. > GDAL has a driver for > > Jasper jpeg2000. But GDAL does not allow NITF with > Jasper. GDAL only allows > > NITF with ECW jpeg2000, which we know (1)does not > support 16bit and (2)has > > license issue. Why GDAL does not support Jasper > jpeg2000 in NITF? > > > > Best Regards, > > > > Mo > > > > --- On Sat, 3/28/09, Ivan Lucena <ivan.luc...@pmldnet.com> > wrote: > > > From: Ivan Lucena <ivan.luc...@pmldnet.com> > > > Subject: Re: [gdal-dev] Is it a big thing to > change ECW to support 16-bit > > > imagery? To: "mohwawang" <mohwaw...@yahoo.com> > > > Cc: gdal-dev@lists.osgeo.org > > > Date: Saturday, March 28, 2009, 12:10 AM > > > Mo, > > > > > > See, GDAL does not implement the code that > actually reads > > > the ECW format. The GDAL ECW driver just make > calls to a > > > external library. That library is provided by the > company > > > that holds the copyright for that format [1]. So > you would > > > need to ask and negotiate with then first. > > > > > > But I believe that they probably have thought > about that > > > before and maybe that *is* a "big thing", as you > said. It is > > > not just a matter of storing pixels values but it > is matter > > > of running a algorithm to calculate the wavelets. > Or maybe > > > is just because that is how and why the format > was designed. > > > I mean, for byte image. > > > > > > But if they *do* decided to implement that change > I believe > > > it will be pretty simple for anyone of the GDAL > driver's > > > developers to make the necessary changes to adapt > to it. > > > > > > But like I said before, don't hold you breath > waiting for > > > that. I don't think that there is a chance. > > > > > > [1] http://www.gdal.org/frmt_ecw.html > > > > > > My best regards, > > > > > > Ivan > > > > > > mohwawang wrote: > > > > Mateusz, > > > > > > > > License issue can be resolved through > negotiation. > > > > > > Then back to the technique issue: Is it a big > thing to > > > change ECW to support 16-bit imagery? > > > > > > > Mo > > > > --- On Fri, 3/27/09, Mateusz Loskot <mate...@loskot.net> > > > > > > wrote: > > > >> From: Mateusz Loskot <mate...@loskot.net> > > > >> Subject: Re: [gdal-dev] Is it a big > thing to > > > > > > change ECW to support 16-bit imagery? > > > > > > >> To: "mohwawang" <mohwaw...@yahoo.com> > > > >> Cc: gdal-dev@lists.osgeo.org > > > >> Date: Friday, March 27, 2009, 7:31 PM > > > >> > > > >> mohwawang wrote: > > > >>> Mateuse, > > > >>> > > > >>> So what's the answer to the > "correct" > > > > > > question? > > > > > > >> Read the license. > > > >> > > > >> Best regards, > > > >> -- Mateusz Loskot, http://mateusz.loskot.net > > > >> Charter Member of OSGeo, http://osgeo.org > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > gdal-dev mailing list > > > > gdal-dev@lists.osgeo.org > > > > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > _______________________________________________ > > gdal-dev mailing list > > gdal-dev@lists.osgeo.org > > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
