[Tilecache] Transparent backgrounds are black in Google Maps

[Roger André]

Ok, so I think this might actually be a Tilecache issue, though I'm sure it
can be resolved via configuration.  I took a look in the cache, and the
tiles there don't have the background set to transparent.  However, when I
make a WMS request directly, the tiles are returned with alpha correctly
inside of them.

I've read that this is because Tilecache doesn't correctly forward the
"Transparent=true" request to the WMS service.  Is that true?
--

On Tue, Sep 23, 2008 at 7:41 PM, Roger André <randre at gmail.com> wrote:

> Tried that, still get black.  And I'm using Firefox, which I forgot to
> mention earlier.
> --
>
>
> On Tue, Sep 23, 2008 at 7:04 PM, Arturo Torres <artorresv at yahoo.com.mx>wrote:
>
>> Try using GIF's, IE6 does not support PNG transparency
>>
>>
>> ----- Mensaje original ----
>>
>> 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>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> 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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