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# create transparency band
for f in *tif;
do
  gdal_translate -b 1 -ot Byte $f red.tif;
  gdal_translate -b 2 -ot Byte $f green.tif;
  gdal_translate -b 3 -ot Byte $f blue.tif;
  gdal_translate -a_nodata none $f no.tif;
  gdal_calc.py -A no.tif --outfile=mask.tif --calc="(A<=255)*255";
  gdal_merge.py -separate -o ../ToCompress/$f red.tif green.tif blue.tif mask.tif;
  sudo rm red.tif;
  sudo rm green.tif;
  sudo rm blue.tif;
  sudo rm no.tif;
  sudo rm mask.tif;
done

# compress using tiled jpeg
for f in *.tif
do
  gdal_translate -co COMPRESS=JPEG -co TILED=YES $f ../ToUpload/$f;
done

# create overviews
for f in *.tif
do
  gdaladdo --config COMPRESS_OVERVIEW JPEG --config INTERLEAVE_OVERVIEW PIXEL -r average $f 2 4 8 16 32 64;
done