[gdal-dev] 4th band as ALPHA on warp

[Fernando Ribeiro]

Dear list,

Currently we are working with 4 band tifs, first 3 bands as normal RBG 
and the 4th as IR. On performing a warp operation from and to a VRT, 
GDAL seems considering the 4th band as alpha, resulting in full black 
pixels if 4th band value =0.

Some attempts were made to solve this issue, so far without success:

- Using the warp creation options PHOTOMETRIC=RGB and ALPHA=NO

- Manually editing the source VRT and replace Alpha color interpretation 
to Undefined

Does anyone have more suggestions?

Thank you

-- 
Regards,
Fernando Ribeiro
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