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PNG or not PNG? v. 9 Development Question
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MrMellie View Drop Down
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Points: 251 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMellie Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2007 at 9:08am
After finding this page about the problem:

PNG Alphachannel JS hack

I too now think that, yeah, go for it with the JS hack. 49.8% of my users are still using IE6 but as said, they need JS for the forum to work so we might as well push forward with a better graphics format.
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mxm.Kosh View Drop Down
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Points: 14 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mxm.Kosh Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2007 at 7:09am

@borg:

We developed a new tool some weeks ago. Because this was an internal tool we optimized it for IE7 and FF2. We also used PNGs for layout, icons and gfx-effects.

It was very cool to play with png - lot of things we can't do this easy way without png.

But we found a problem:
If you use a PNG-based layout and for example have a javascript fadein or similiar effect the IE rendering engine slows down very much. We tested this effect on a highend machine - same effect! There is no problem with firefox. For me it looks like they have implemented PNG support as easy they can - it's not fully implemented, it's like an overlay :(

So please be careful if you use PNG in V9 - we switched back to GIF and everything is fine now. The only problem is, that we have to create GIF-images for each color instead of creating one PNG with a transparency of 30%...

Just a info for you - whatever your decision will be, we'll use V9 anyway =)
Chris
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Thats very interesting, we will have to certainly do allot of testing before making the final decision then. 
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mxm.Kosh View Drop Down
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Points: 14 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mxm.Kosh Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2007 at 2:55pm
Update:
 
I've talket with our DOM-god about the PNG problem again and here are more details:
 
The problem is not the PNG itself. If you just use png-icons as replacement for gif-icons there should be no problems (should!).
 
If you use png images with alpha-transparency and animate them (fade-effect with javascript for example) the IE rendering engine slows down.
 
In fact: Everything dynamic (for example ajax) that changes little things (new background-color) forces IE to re-render the page and this seems to be the problem because the rendering of the alpha-channel pngs is buggy...
 
Hope this helps when you test V9.
Chris
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mack View Drop Down
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Points: 90 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mack Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2007 at 1:26am
Originally posted by Scotty32 Scotty32 wrote:

i think it would be great to use PNGs but - alot of people will still be using IE 6

and due to this, your partically forced to use GIFs

if it helps - Roundcube Webmail seems to be able to show PNGs for FF and GIFs for IE


You could do this, as converting images to gif is easy. But whats nice about PNG you can use this software: http://brh.numbera.com/software/pnggauntlet/ to convert the PNG's to be even smaller, with no quality loss.
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