[gdal-dev] warp ARGB -> RGB gtiff-jpeg?

[Idan Miara]

Hi Jukka,

Thanks for your reply!
I didn't think about using VRT.
Using VRT (-b 1 -b 2 -b 3) as an input to warp solved the problem.

Idan

On Sat, 20 Feb 2021 at 23:52, jratike80 <jukka.rahkonen at maanmittauslaitos.fi>
wrote:

> Hi,
>
> It is very cheap to use gdal_translate and VRT as intermediate format. As
> far as I know it is not possible to drop alpha with gdalwarp even it is
> possible to add alpha -dstalpha.
>
> -Jukka Rahkonen-
>
>
>
> Idan Miara wrote
> > Hi All,
> >
> > Is it possible to use gdal_warp for warping the RGB bands of an ARGB
> > raster
> > as gtiff with jpeg compression (i.e. to drop the Alpha channel and
> > transform CRS). ?
> >
> > gdal_transalte has translate_options["bandList"] = [1, 2, 3] for that,
> but
> > I can't find the equivalent for warp.
> >
> > I could do it in two steps - save as a lossless gtiff and then use
> > gdal_transalte to make a jpeg-gtiff. Or use gdal_trasnlate to make a 3
> > band
> > lossless gtiff and then wrap it.
> >
> > Can I do it in one step without an intermediate file?
> >
> > Regards,
> > Idan.
> >
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>
>
>
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