[Tilecache] Transparent backgrounds are black in Google Maps

[Arturo Torres]

Try using GIF's, IE6 does not support PNG transparency 


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Message: 1
Date: Mon, 22 Sep 2008 14:17:06 -0700
From: " Roger Andr? " <randre at gmail.com>
Subject: [Tilecache] Transparent backgrounds are black in Google Maps
To: tilecache at openlayers.org
Message-ID:
    <9c2015090809221417k722c8f15pdda00555265397a5 at mail.gmail.com>
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Hi everyone,

I'm fairly certain this has nothing to do with Tilecache, but I figure
someone else using it may have encountered the same problem in the past.  I
have a tile layer that's being served up as RGBA .png's with backgrounds set
to transparent.  In everything beside by Google Maps web page, the
backgrounds are transparent.  In Google Maps the backgrounds are displayed
as black.

gdalinfo says the following about the image type:
Band 1 Block=731x1 Type=Byte, ColorInterp=Red
  Mask Flags: PER_DATASET ALPHA
Band 2 Block=731x1 Type=Byte, ColorInterp=Green
  Mask Flags: PER_DATASET ALPHA
Band 3 Block=731x1 Type=Byte, ColorInterp=Blue
  Mask Flags: PER_DATASET ALPHA
Band 4 Block=731x1 Type=Byte, ColorInterp=Alpha

Pretty sure it's a problem on the display side, not the image creation or
fetching side, but I'm having trouble tracking it down.

Thanks,

Roger
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