Hi,
This follows a discussion in the qgis-user mailing list. We are using
gdal_translate (and QGIS "export as") on a 8bit unsigned single band
tiff to a .gpkg. When using no -ot switch or when using -ot Byte, this
results in a 4 band .gpkg raster with the wrong values. (Values in band
1 to 3 are similar but off the mark). Band 4 is set at 255 as expected.
Looks like some type of compression is going on in the band 1 to 3).
When saving using the -ot Int16 or Float32 switch, all is well and the
result has one band with the correct values.
ex: gdal_translate -ot Int16 -of GPKG "E:/Users/Nicolas/Google Drive
Nicolas/Partage_temporaire/qgis/int16.gpkg" "E:/Users/Nicolas/Google
Drive Nicolas/Partage_temporaire/qgis/int16.gpkg"
Is this a possible problem with the driver or is the problem sitting 18
inches in front of the screen? Problem similar on a Mac running QGIS
3.10.1-A with GDAL 3.0.2 and QGIS3.16 on Windows running GDAL 3.1.4.
Test files are found here:
https://drive.google.com/drive/folders/1fMl9odowUFFRQFK61rTxgHeom_D8ymN6?usp=sharing
Thanks!
Nicolas
Nicolas Cadieux
https://gitlab.com/njacadieux
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