HI All,
Many thanks for the all the responses. Interesting discussion; I've learnt
a lot.
I think my next step is to do some testing; I've not tried the four band -
RGBI imagery yet. When I do I'll post back here with whatever seems to work
best.
Cheers,
Jonathan
On 12 November 2013 13:45, Even Rouault <even.roua...@mines-paris.org>wrote:
> Selon Andrea Aime <andrea.a...@geo-solutions.it>:
>
> > On Tue, Nov 12, 2013 at 12:45 PM, Simone Giannecchini <
> > simone.giannecch...@geo-solutions.it> wrote:
> >
> > > >
> > > > Will the PHOTOMETRIC= YCBCR work with a four band RGBI?
> > > >
> > >
> > > It should not.
> > >
> >
> > Actually... JPEG itself is not defined on 4 bands images as far as I
> know?
> > Maybe GDAL is dropping the 4th band during the JPEG compression?
>
> The YCbCR JPEG profile of TIFF is indeed limited to 3 bands. So if you
> pass a 4
> band image, gdal_translate should refuse to process it.
> You can JPEG compress a 4 band image, but it will use a JPEG codestream
> for each
> band independantly, so the resulting size will be bigger.
> A possible option would be to generate 2 GeoTIFFs for each input file : one
> YCbCR JPEG compressed with the RGB components, and one JPEG compressed
> with the
> I component. But that might complicate the overall workflow.
>
> Even
>
> >
> > Cheers
> > Andrea
> >
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