But I need another piece of advice.
Using alpha transparency, with the 4 bands, I cannot use
PHOTOMETRIC=YCBCR, and I used PHOTOMETRIC=RGB.
This way the compression is a little less effective.
Is there anything comparable, in terms of compression effectiveness,
when using alpha transparency and JPEG compression?
Should I change the type of compression?
require to create a mask band from the 4th band of the input by changing
-b 4 to -mask 4, removing -co ALPHA=YES, and then you can ask YCbCr
gdal_translate -b 1 -b 2 -b 3 -mask 4 -co BIGTIFF=YES -co COMPRESS=JPEG
-co PHOTOMETRIC=YCBCR -co JPEG_QUALITY=75 -co TILED=YES -co
NUM_THREADS=ALL_CPUS warp.vrt output.tif
Note: if you use the COG driver it will do that automatically for you:
gdal_translate -of COG -co BIGTIFF=YES -co COMPRESS=JPEG -co
NUM_THREADS=ALL_CPUS warp.vrt output.tif
Thank you,
Andrea
--
___________________
Andrea Borruso
website: https://medium.com/tantotanto
38° 7' 48" N, 13° 21' 9" E, EPSG:4326
___________________
"cercare e saper riconoscere chi e cosa,
in mezzo all’inferno, non è inferno,
e farlo durare, e dargli spazio"
Italo Calvino
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http://www.spatialys.com
My software is free, but my time generally not.
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