[OpenLayers-Dev] PNG - AGG image, opacity and IE7

[Pierre GIRAUD]

Hum, just found that
http://www.quirksmode.org/bugreports/archives/2007/02/Cant_have_both_PNG32_and_alphaopacity_in_IE7.html

It seems like it is exactly linked to your problem.

Regards,
Pierre

On Fri, Jul 18, 2008 at 11:34 AM, Guillaume Sueur
<guillaume.sueur at neogeo-online.net> wrote:
> Hi Pierre,
>
> Here are two print screen :
> agg_opacity_1.png : the layer as seen in IE7 with no transparency : perfect.
> agg_opacity_0_5.png : the layer as seen in IE7 with 50 % transparency :
> ugly.
>
> Note that the style of the layer hasn't got any background.
>
> Guillaume
>
> Pierre GIRAUD a écrit :
>>
>> Is your image displayed correctly by IE7 if you try to show it alone
>> in your browser (with a background color) ?
>> Can you send us a example of generated image ? And a screenshot of the
>> unexpected behavior ?
>>
>> Regards,
>> Pierre
>>
>>
>> On Fri, Jul 18, 2008 at 9:45 AM, Guillaume Sueur
>> <guillaume.sueur at neogeo-online.net> wrote:
>>>
>>> Kenneth Skovhede, GEOGRAF A/S a écrit :
>>>>
>>>> I have seen this as well. It happens whenever you set the "alpha" value
>>>> in IE7.
>>>> It even happens if the value is set to 1.0, but a fix in OpenLayers 2.6
>>>> removes
>>>> the "alpha" value if the opacity value is greater than 1.0.
>>>> (OpenLayers.Util.modifyDOMElement line 191).
>>>>
>>>> I'm fairly sure its an IE bug.
>>>
>>> So am I ! Just wanted to kown if a kind of workaround was possible.
>>>
>>> Guillaume
>>>
>>>
>>>> Regards, Kenneth Skovhede, GEOGRAF A/S
>>>>
>>>>
>>>>
>>>> Guillaume Sueur skrev:
>>>>>
>>>>> no, mapserver, but it's a typical client problem.
>>>>> when the polygon is filled, it looks quite ok, because only the outline
>>>>> border is wrong, but with lines and labels, whaouh, so crap !
>>>>> when opacity is 1 or format is standard PNG, the problem doesn't show
>>>>> up.
>>>>>
>>>>> Guillaume
>>>>>
>>>>> Zac Spitzer a écrit :
>>>>>
>>>>>> was this using mapguide? I have seen similiar problems
>>>>>>
>>>>>> On Fri, Jul 18, 2008 at 12:11 AM, Guillaume Sueur
>>>>>> <guillaume.sueur at neogeo-online.net> wrote:
>>>>>>
>>>>>>> Hi devs,
>>>>>>>
>>>>>>> When displaying a WMS layer (AGG image) with some transparency on
>>>>>>> IE7,
>>>>>>> it shows ugly grey pixels surrounding the borders. I guess it comes
>>>>>>> from
>>>>>>> a mishandling of the antialiased pixels from AGG. Any trick to hold
>>>>>>> that ?
>>>>>>>
>>>>>>> Thanks
>>>>>>>
>>>>>>> Guillaume
>>>
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>>>
>>
>
>
>