[OpenLayers-Dev] PNG Transparency on IE 6

[Antonio Volpicelli]

Thanks Chris and Steven,
I have switched to GIF and works fine now , but I am curious  to  test  
the 'alpha':true option too just  to see how  much it  slowdown.

Thanks

Ciao
Antonio

Christopher Schmidt wrote:
> On Fri, Mar 02, 2007 at 10:29:57AM +0100, Steven M. Ottens wrote:
>   
>> Hi antonio,
>>
>> There is a solution; the FixPNG workaround, but it's slow. This is  
>> not a big problem if you have 3 PNG images, but if you enable tiling,  
>> you easily get up to 30 images and it takes up to minutes to draw the  
>> layers. Also with this workaround the images are not displayed until  
>> all the images are loaded and fixed. Which gives your application a  
>> very sluggish feel to it.
>>     
>
> Indeed, we used to have this on by default, but turned it off when we
> realized that it basically made applications unusable.
>
> The way to enable this is to add an 'alpha':true option to your layer
> options:
>
>  new OpenLayers.Layer.WMS("Name", "url", {'params':'here'},
>  {'alpha':true});
>
> But you should be aware that this is likely to cause serious slowdowns
> in IE6, and should be tested before deployment.
>
> I recommend using GIF (or 8bit PNGs) for your overlays in IE6.  
>
> Regards,
>