[ka-Map-users] GIF transparency

Delfos, Jacob jacob.delfos at maunsell.com
Mon Aug 8 23:21:59 EDT 2005

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?



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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