[ka-Map-users] GIF transparency

[Delfos, Jacob]

Hi List,

Just experimenting with ka-map, making it output GIF images for all layers
that are assumed not to be full-colour (raster), so that I can have
transparency in AND 24bit colour in IE without the PNG hack. All works well,
and I get the right imagetype. Only thing is.... My GIF's are not
transparent. Even if I use Ka-map the normal way (no magic), specifying GIF
as imagetype, I don't get transparency. 

In tile.php, it says:

------------------------------------------------------------------
$nTransparent = imagecolorallocate($oTile, $oMap->imagecolor->red,
$oMap->imagecolor->green, $oMap->imagecolor->blue);
imagecolortransparent( $oTile,$nTransparent);
------------------------------------------------------------------

When I request the GIF properties in Irfanview, it tells me the transparent
colour is "0". I assume that is 0, 0, 0. But transparency is set to the
imagecolour of my map, which is 255,255,255 (correctly picked up in
tile.php, I checked that).

I'm using php_mapscript_46. Any ideas?

Regards,

Jacob


JACOB DELFOS
SPATIAL INFORMATION ANALYST
Maunsell Australia Pty Ltd
629 Newcastle Street, Leederville, WA 6007
PO Box 81, Leederville, WA 6902
Western Australia
ABN 20 093 846 925

Tel     + 61 8 9281 6185
Fax    + 61 8 9281 6297
jacob.delfos at maunsell.com

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