[gdal-dev] Re: Gdal Bug? was: Re: JP2MRSID Issues

[Even Rouault]

A similar problems seems to have been reported in 
http://trac.osgeo.org/gdal/ticket/1231 

Le Friday 14 November 2008 19:39:53 Rahkonen Jukka, vous avez écrit :
> Stephen Woodbridge wrote:
>
> Jukka Rahkonen wrote:
> >> Hi,
> >>
> >> There is absolutely something basically wrong.  For that little files
> >> conversion to GeoTIFF should take perhaps 5 minutes.  Try skipping more
> >> drivers and see how Kakadu driver performs.  If you want to know how
> >> fast it can be, download Kakadu win32 executables from
> >> www.kakadusoftware.com and measure how long it takes to expand your
> >> images to GeoTIFFs with kdu_expand.
> >
> > Hi Jukka,
> >
> > Thank you for that pointer. I grabbed the linux version and kdu_expand
> > is really fast!!! 2 mins if the source file is not cached and 55 sec if
> > it is cached by the file system. But is only is expanding the first
> > band, do you know how I can get it to expand bands 1,2,3 into the tiff
> > as r,g,b? If I can do that then I could just use that as an interim step
> > to expand the jp2 into a tif and then do the gdalwarp based on that.
>
> Hi,
>
> Kakadu executables are demonstration programs showing some examples about
> what can be done with Kakadu SDK. They are working and effective programs
> but not user friendly and not even meant to be such. Another problem is
> that jpeg2000 is not extremely easy to understand. At least I consider it
> complicated. Have a try with reading what you get by giving kdu_compress
> -usage, or kdu_expand -usage, or by reading the usage_examples.txt file
> that you probably have now :)
>
> Without knowing how your jpeg2000 original is made it is hard to say how
> you could take out the three channels you want with kdu_expand.  This might
> do it channel by channel, but you would need to construct three individual
> files together to make a colour image: c:\kakadu60\kdu_expand
> -raw_components -skip_components 0 -i input.jp2 -o red.tif
> c:\kakadu60\kdu_expand -raw_components -skip_components 1 -i input.jp2 -o
> green.tif c:\kakadu60\kdu_expand -raw_components -skip_components 2 -i
> input.jp2 -o blue.tif
>
> But this is gdal-dev mailing list (Kakadu users Yahoo group exists but it
> is rather quit) and I can say that I have used gdal for converting jpeg2000
> images to other formats a lot and for me it has worked fine. Our images are
> mostly 3-channel aerial photos which are easier to handle than yours
> 4-channel images, but also 7-band Landsat mosaics. You should be able to do
> fine with gdal.
>
> If you can show me a place where I could download one of your images I
> could have a try with it some day.
>
> -Jukka Rahkonen-
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