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Transparent PNG in KMZ export
I'm trying to use GM10 to export KMZ / KML, via a script. The raster format is to be PNG. All is well, except that I need colour 0 to be transparent. It looks to me like the Export KMZ dialog does not allow for a transparent color to be set.
Unfortunately the BG_TRANSPARENT keyword does not seem to do anything for PNG within a KMZ.
I can use Tools > Control Center then select an overlay, then Options > Transparency etc. However, the gotcha is that I cannot do that via a script, even with a Sendkeys approach, because it appears to be impossible to select the overlay within the Control Center, without using a mouse. Obviously, if a mouse is needed, the automated scripting won't work.
I don't think I can use the batch convert, because I cannot set the output projection that way (it has to be geographic / WGS-84).
Any ideas on how I can get my KMZ exported, in an automated way, making color 0 transparent?