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Posted by Jim Higson on 12/02/49 11:50
CrackWilding wrote:
> This might not the best place for this, but what the heck. I've got a
> page that has a bunch of 24-bit PNG files with transparency. For IE I'm
> using the AlphaImageLoader filter to get around it's limitations with
> the format. I've been doing this for about a year, having seen Google
> successfully deploy the solution with Google Maps, and I've never had
> any problems with it.
>
> Well, now I've got a client that's having a problem. Some (not all,
> oddly) of the PNGs on his website are displaying with a bunch of black
> stuff on top, like a censor went over them with a black marker.
> Transparent PNGs do this when printing sometimes, but I've never seen
> it onscreen. The client is using IE6 on Windows XP. So I checked half a
> dozen computers with the same setup and haven't been able to reproduce
> the problem.
>
> The only difference I can detect is that he's using a Comcast
> co-branded copy of IE. I suspect that Comcast may have damaged
> something... who knows?
>
> Any thoughts? I can't post the site, unfortunately, but I've posted a
> screenshot of the problem here:
A few ideas:
1) The PNGs are indexed (paletised) - IE can't do transparent, indexed PNGs
even with the AlphaImageLoader hack.
2) IIRC, AlphaImageLoader has some hardware transparency stuff built in
(could be wrong on this point), if this is so, perhaps it is a video card
or drivers issue. I've seen bad graphics hardware cause similar problems in
games.
Good luck. Personally, I'd just ask the client to use a proper browser.
--
Jim
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