>
> One thing to be aware of is PNG color-shifting in IE. If you try to use
> a non-transparent PNG with non-square edges and "fill in" the background
> color, then place it inside a region with a CSS background-color, they
> may not match up exactly, even with supposedly the same hex values. Even
> when opening the PNG in Photoshop, it will show the PNG as having the
> correct hex value. In these circumstances, it's best just to use a 10x10
> pixel flat color PNG as your background-image for the container region.
> Don't use smaller tiles than 10x10 (i generally go for at least 20x20
> myself) as this puts a lot of strain on the client and you may get
> strange rendering glitches, especially on older machines.
>
> Of course, similar problems arise with JPEGs, especially when saved at
> low-quality, but at least with JPEGs you can validate the hex value
> shift in Photoshop.
>
> david


That is an interesting tip I didn't know about. I've always preffered PNGs
for their quality and for being free (as in freedom ;-))...
I've found something in a page (
http://www.cristalab.com/tips/21618/png-con-transparencia-alpha-en-internet-explorer)
suposed to correct transparency problems, which I don't quite understand.
What do you think?:

filter:progid:DXImageTransform.Microsoft.AlphaImageLoader»
(src='imagen.png',sizingMethod='scale');

<img src="imagen.png"
style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader
(src='imagen.png',sizingMethod='scale');" alt="" />


There's also a way of coming around png problems in IE using javascript.
http://www.aoyama.com.mx/foros/viewtopic.php?t=24
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