[OpenLayers-Dev] [Geoserver-devel] Are there png8 wms tile problems with IE?

[Andrea Aime]

louvy.joseph at gmail.com ha scritto:
> I am cross posting this on both geoserver & openlayers lists..
> 
> Recently I was enquiring if any of you have seen the exception issues 
> with geoserver 1.5.3. I have further problems with 1.5.3, this time with 
> PNG8.
> 
> Is the png8 format rendered by geoserver-1.5.3 fully compliant with the 
> PNG specs?  Please ignore my lack of knowledge on PNG. Are there any 
> limitations or certain features not being implemented for this png8 
> format? I am using Openalyers 2.4 on the client side. Everything is fine 
> on firefox. But both IE6 & IE7 have problems with the  png8 produced by 
> geoserver. This manifests in couple of ways:
> 
> 1) Most of the times, the IE gets redirected to some other page when I 
> use png8 format for openlayers wms layer. (If I use png instead of png8, 
> everything is fine). I am hypothesizing that IE is not able to process 
> the geoserver png8 and gets  confused.
> 
> 2) Lot of times with png8, the openlayers lands in 
> OpenLayers.Util.onImageLoadError() handler. Basically IE thinks that 
> there is some problem with image URL; however the IE ends up drawing the 
> WMS content of the png8 tile fine (but the tile soon gets replaced by a 
> pink tile). Looks like IE thinks that there is something wrong with this 
> tile even though it was able to render it fine. The problem does not 
> consistently happen with one particular tile; the same tile on refresh 
> comes out fine.

I would be happy to investigate this, but I can't reproduce any of these
problems with the geoserver standard data set. If you can give me
a full set of data, requests and whatnot needed to reproduce these
errors I'll be happy to have a look at it.

Cheers
Andrea