[OpenLayers-Users] Release?

[Paul Spencer]

Chris,

IE transparency hack is only required for 24bit PNG images that  
include alpha transparency.  IE will correctly work with 8bit and  
24bit PNG images that have transparency without the hack.  And it  
will work with GIF as well without the hack.

Cheers

Paul

On 22-Jun-06, at 3:23 PM, Christopher Schmidt wrote:

> On Thu, Jun 22, 2006 at 11:30:44AM -0600, Corey Puffalt wrote:
>> Schuyler,
>>
>> Thanks for your reply.
>>
>> On 6/22/06, Schuyler Erle <sderle at metacarta.com> wrote:
>>>
>>> Actually IE6 compatibility is of enormous importance to us. Can you
>>> give us a clear idea of the problems you are encountering?
>>
>>
>> Good to hear that.  I have come across two issues.  I've just  
>> submitted
>> tickets for both of them: #95 & #96.  The first one is that the  
>> MouseToolbar
>> buttons don't change state visibly when the user clicks on them  
>> although
>> they are otherwise functional.  The second one is a little more  
>> subtle (at
>> least if you're using layers that render quickly):  I've found  
>> that under
>> IE6 the map does not refresh until all the image tiles are  
>> loaded.  With a
>> slow map server this makes a huge difference to the perceived  
>> responsiveness
>> of the map.  I played with Google Maps for a while and it looks  
>> like they
>> have found some way to work around this.
>
> I fixed the former with r680. The latter we've implemented a  
> workaround:
> the primary slowness that is causing this appears to be the IE alpha
> Transparency. Since many layers don't have/need transparency, we've  
> made
> the images *not* be returned in an alpha-transparency hack div for the
> time being, *unless* a transparent: 'true' param is passed in the WMS
> request. (An example diff is in r684.) This is far from a perfect
> solution, but seems to make things speedier by default, and we'll keep
> this in mind as a performance problem moving forward, one which
> hopefully will be helped by #92, "Implement tile image/div reuse"
> (although I'm not making any promises yet ;)).
>
> Thanks for calling our attention to these!
>
> -- 
> Christopher Schmidt
> Web Developer
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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