[ka-Map-users] PNG transparency not supported in internet explorer

Jacob Delfos jacob.delfos at maunsell.com
Thu Aug 4 02:29:50 EDT 2005


Thanks for that info. I wasn't aware of it. You'd have thought Microsoft would have fixed that up a while ago.

I guess I'll have to use gif to get transparency. Would be good if the imagetype could be different for each layer, to be able to keep 24bit colour. I might look into doing that. Worked well for me in Chameleon.



From: Emil Zegers [mailto:taatuut at planet.nl] 
Sent: 4 August 2005 14:26
To: Delfos, Jacob; ka-map-users at lists.maptools.org
Subject: RE: [ka-Map-users] PNG transparency not supported in internet explorer

Hello Jacob,

At the moment IE 5.5+ does not properly support PNG transparancy (IE7 beta does, see http://blogs.msdn.com/ie/archive/2005/07/29/445242.aspx)

However, there are some hacks to provide PNG transparancy for 24/32 bit PNG's in IE 5.5+, some are listed at http://blogs.msdn.com/ie/archive/2005/04/26/412263.aspx.

A good one is the hack at webfx http://webfx.eae.net/dhtml/pngbehavior/pngbehavior.html

Of course do not forget to question yourself if using hacks for this is what you want. On the other hand if you want to support PNG transparancy for IE this is a nice solution.


-----Original Message-----
From: ka-map-users-bounces at lists.maptools.org [mailto:ka-map-users-bounces at lists.maptools.org]On Behalf Of Delfos, Jacob
Sent: donderdag 4 augustus 2005 4:32
To: ka-map-users at lists.maptools.org
Subject: [ka-Map-users] PNG transparency not supported in internet explorer

Hi all, 

Just figured out why Internet Explorer keeps coming up with a blank map, but not sure how to fix it. It would appear that Internet Explorer does not support the PNG transparency that mapserver outputs. So my transparent vector layers come out perfectly white where there's no data. Firefox does support it, though. In the screenshot you can see a normal tile and a transparent tile next to one another. The tile comes out transparent in firefox, but not in internet explorer. Has anyone else had this? And.... anything I can do about it?

Not sure of this is in Bugzilla. Seems bugzilla for Ka-Map is down...... 




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