Hi all
I have set up an ImagePyramid layer (thanks Daniele) that I query via WMS
format=image/png
transparent=true
It uses the default raster style.
When there are granules in the bbox, even when they only partially cover
the area, the region where there is no granule is transparent.
But when there are really no granule to load at all, the resulting PNG
is fully black, with no transparency.
When using gdalinfo on the "normal" PNG image I have :
Band 1 Block=1281x1 Type=Byte, ColorInterp=Red
Mask Flags: PER_DATASET ALPHA
Band 2 Block=1281x1 Type=Byte, ColorInterp=Green
Mask Flags: PER_DATASET ALPHA
Band 3 Block=1281x1 Type=Byte, ColorInterp=Blue
Mask Flags: PER_DATASET ALPHA
Band 4 Block=1281x1 Type=Byte, ColorInterp=Alpha
When using gdalinfo on the "black" PNG image I have :
Band 1 Block=1281x1 Type=Byte, ColorInterp=Gray
Mask Flags: PER_DATASET ALPHA
Band 2 Block=1281x1 Type=Byte, ColorInterp=Alpha
I cannot set outputtransparentcolor to #000000, because I have black
areas in my granules that must not be rendered as transparent.
I have found this old thread that seem to be relevent in my case :
http://osgeo-org.1560.x6.nabble.com/ImageMosaic-transparency-problem-td3795094.html
but I don'ty think the solution would be suitable for me, because I have
no control over the input granules' palette.
So how can I have a fully transparent PNG image when there is no granule
in the queried bbox ?
Thanks a lot for your help !
Best regards
--
Arnaud
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