[gdal-dev] GDAL translate 16 bit to 8 bit

[Cleo Drakos]

hi Hanlie,
can you tell me what value you put for -scale to convert into 8 bit?

cleo


On Fri, Aug 22, 2014 at 7:02 PM, Hanlie Pretorius <
hanlie.pretorius at gmail.com> wrote:

> Hi Even,
>
> Yes, I quoted the exact message, but it displays in the QGIS interface.
>
> I tried gdal_translate with the -ot and -scale parameters on the
> multispectral image and that worked much better, thanks.
>
> Regards
> Hanlie
>
> 2014-08-21 20:33 MGT+02:00, Even Rouault <even.rouault at spatialys.com>:
> > Le jeudi 21 août 2014 08:57:32, Hanlie Pretorius a écrit :
> >> Hi,
> >>
> >> I'm working with a 16 bit SPOT 6 image that I want to convert from 16
> >> bit pixel depth to 8 bit pixel depth. I say 16 bit, but if I load the
> >> file into Envi, it reports that uses only 12 bits. However gdalinfo
> >> reports 16 bit (see below).
> >>
> >> I've manage to do so on the multispectral image, but the result is
> >> poor colour wise.
> >>
> >> So I split the image into its four bands that is, I now have one image
> >> per
> >> band.
> >>
> >> When I now try to convert to 8 bit, I get a message that says:
> >> "Warning 742327101_R1C1_band1_8bit.TIF not created".
> >
> > Are you quoting the exact message ? I can't find any trace of it in the
> > relevant parts of the source code. Did you check that you have write
> > permissions in the directory where you launch the command ?
> >
> > Anyway for what you want to do you likely need to explore the -scale
> option
> > of
> > gdal_translate. But that's unrelated to the error
> >
> >>
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