[gdal-dev] [GDAL-dev] convert rgba alpha layer to rgb white

[Pierre CARREAUD]

Hi list,

I’m trying to assembly some RGBA tiff in one with gdalbuildvrt and then to
translate them to a RGB TIFF tiled file YCBCR jpeg compressed.

No problem
 But now, I would like to get a white color in the background
instead of the black.

 

The following commands work but I get nodata (and so, black) on any white
pixels whereas I just wanted to convert alpha to white
 The problem in on
the vrt.

 

gdalbuildvrt assembly.vrt -srcnodata b4 –hidenodata -vrtnodata 255 *.tif

gdal_translate -of GTIFF -b 1 -b 2 -b 3 -co COMPRESS=JPEG -co
JPEG_QUALITY=95 -co TFW=YES -co BIGTIFF=YES -co ALPHA=NO -co TILED=YES -co
PHOTOMETRIC=YCBCR -co PROFILE=BASELINE assembly.vrt assembly_JPG.tif

gdaladdo -r gauss -ro --config COMPRESS_OVERVIEW JPEG --config
JPEG_QUALITY_OVERVIEW 95 --config BIGTIFF_OVERVIEW YES --config
PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL --config
NODATA_VALUES 255 assembly_JPG.tif 2 4 8 16 32 64 128 256

 

Do you have an idea? The problem is the is not –init option, just -vrtnodata
“255 255 255” to fix both background color but also the nodata bandper band


 

Pierre CARREAUD

Spécialiste en imagerie numérique

 


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