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Png transparency goes black when rotating div in IE8

marcusfriberg test
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This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Hi guys,


I am animating a div with a transparent background (the ball). When I use rotation the transparent background seems to get a black background in IE8. This only appears when I use css rotation in my animation. 


Is there someone who have seen this before and knows how to get rid of this problem? Is it possible to use rotation in any other way than css?

This is what my animation looks like;

tlBall.to(ball, 0.2, {css:{left:"400px",top:"366px",rotation:360}, delay:0, ease:Sine.easeInOut})


This is that the background with the ball looks like;



- Marcus


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Hello marcusfriberg, and Welcome to the GreenSock Forums!


That is an issue with IE8 and how it handles transparent PNG images. To remove the black matte you have to do either of the following:


Try using the CSS IE filters:

#ball {
    background: url('images/ball.png') no-repeat 0 0 transparent;
    /* IE7 */
    filter: progid: DXImageTransform.Microsoft.gradient(startColorstr = #00FFFFFF,endColorstr= #00FFFFFF)progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled= 'true', sizingMethod = 'crop', src = 'images/ball.png');
    /* IE8 */
    -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#00FFFFFF,endColorstr=#00FFFFFF)progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='crop',src='images/ball.png')";

Or using JavaScript to apply the filter in IE on all png images:

var i;
for (i in document.images) {
    if (document.images[i].src) {
        var imgSrc = document.images[i].src;
        if (imgSrc.substr(imgSrc.length - 4) === '.png' || imgSrc.substr(imgSrc.length - 4) === '.PNG') {
            document.images[i].style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='crop',src='" + imgSrc + "')";

Hope this helps? :)

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this piece of CSS works perfect for me:

background: transparent;
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#00FFFFFF,endColorstr=#00FFFFFF)";
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#00FFFFFF,endColorstr=#00FFFFFF);
zoom: 1;

Add to the img which you animate, and no more HALO effect.





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