[gdal-dev] Is it a big thing to change ECW to support 16-bit imagery?

[mohwawang]

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.lucena at pmldnet.com> wrote:

> From: Ivan Lucena <ivan.lucena at pmldnet.com>
> Subject: Re: [gdal-dev] Is it a big thing to change ECW to support 16-bit imagery?
> To: "mohwawang" <mohwawang at yahoo.com>
> Cc: gdal-dev at 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 <mateusz at loskot.net>
> wrote:
> > 
> >> From: Mateusz Loskot <mateusz at loskot.net>
> >> Subject: Re: [gdal-dev] Is it a big thing to
> change ECW to support 16-bit imagery?
> >> To: "mohwawang" <mohwawang at yahoo.com>
> >> Cc: gdal-dev at 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
> >> 
> > 
> > 
> >   
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> > 
> 
>