On dimanche 1 juillet 2018 11:18:39 CEST Stephen Woodbridge wrote:
> Right, but the point 1 is the message says:
> ERROR 6: PHOTOMETRIC=YCBCR requires a source raster with only 3 bands (RGB)
> ie: requires a source raster with only 3 bands (RGB) and the source
> raster has only 3 bands!
> -dstalpha if I understand correctly is to create a alpha band in the
> output file. So the error message is misleading at best.
I've adjusted the error message
>
> Point 2 is how does one translate a utm to wgs84 using YCBCR and
> generate an appropriate mask or alpha channel to hide the pixels that
> are outside the transformed image. I suppose it needs to be done in
> multiple steps of warp and translate in some specific order with
> specific options but its not obvious how.
try:
gdalwarp -t_srs EPSG:4326 -dstalpha -r bilinear -of GTiff \
-co TILED=YES '00010.jp2' 'tif/00010_rgba.tif'
gdal_translate -b 1 -b 2 -b 3 -mask 4 -co BIGTIFF=YES -co TILED=YES \
-co COMPRESS=JPEG -co JPEG_QUALITY=90 -co PHOTOMETRIC=YCBCR \
--config GDAL_TIFF_INTERNAL_MASK YES \
'tif/00010_rgba.tif' 'tif/00010_rgb_with_mask.tif'
Potentially to save space / time, you can warp to VRT in the first step;
--
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