Unfortunately I have absolutely no idea how to deal with this
transparency problem - all my trials failed.
I am experimenting on four properly referenced GeoTiff, overlapping
files with white margins.
My (temporary) goal was to obtain ONE GeoTIFF file from these FOUR
source files - but, of course, without white margins between them.
So, first I created VRT file from my source GeoTiffs:
gdalbuildvrt -srcnodata "255 255 255" All.vrt Ac3.tif Ac4.tif Ca1.tif
Ca2.tif
and then GeoTiff from this VRT file:
gdal_translate -of GTiff All.vrt All.tif
But white stripes still existed. Also, additional step of creating
separate VRT files for each GeoTiff file and using these files as
components for "All.vrt" didn't help. Messing around with -vrtnodata,
-hidenodata etc. didn't help also. Using -addalpha option causes warning
during destination GeoTiff file generation: "Unable to export color
table to GeoTIFF file" and resulting file is broken.
So, I am stuck...
Do you have any idea what can I try next?
Best regards,
Ralf Wagner
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