Is there a method for displaying a gif with an alpha channel for transparency effects?

Is it possible to make the black color in a realistic gif animation transparent using CSS? The snow is white and everything else is black, but I want to overlay it on my header image with the snow falling realistically. I've seen animations of falling snow in jquery, but they're not as authentic as this one.

If it's not achievable through CSS, what alternative workaround can I use to remove the black background and save it as a PNG file? I could then animate the PNG using the step method.

edit: Check out the "working" fiddle code here

.header {
  width: 100%;
  height: 350px;
  background-image: url(https://s-media-cache-ak0.pinimg.com/originals/fa/6c/d2/fa6cd2d0ff6f0b0f6b89537b7d608a00.jpg);
}

.snow {
  width: 100%;
  height: 100%;
  background-image: url(http://read.html5.qq.com/image?src=forum&q=5&r=0&imgflag=7&imageUrl=http://mmbiz.qpic.cn/mmbiz/jYVY58x65QgvLU6RVkj81CWN1HI1F6DVWibNczicqmrX1a0Hmeb8FicZOOZ8Gia7B67M9Dw6QKjZhEcya93c2ia7zA/0?wx_fmt=gif);
  background-size: 100%;
}
<div class="header">
    <div class="snow"></div>
</div>

css

Answer №1

Check out mix-blend-mode

.header {
  width: 100%;
  height: 350px;
  background-image: url(https://s-media-cache-ak0.pinimg.com/originals/fa/6c/d2/fa6cd2d0ff6f0b0f6b89537b7d608a00.jpg);
}
.snow {
  width: 100%;
  height: 100%;
  background-image: url(http://read.html5.qq.com/image?src=forum&q=5&r=0&imgflag=7&imageUrl=http://mmbiz.qpic.cn/mmbiz/jYVY58x65QgvLU6RVkj81CWN1HI1F6DVWibNczicqmrX1a0Hmeb8FicZOOZ8Gia7Kib67M9Dw6QKjZhEcya93c2ia7zA/0?wx_fmt=gif);
  background-size: 100%;
  mix-blend-mode: screen;/* but like opacity it will affect the whole container and content */
}
<div class="header">
  <div class="snow"></div>
</div>

Another suggestion is to try out background-blend-mode

.header {
  width: 100%;
  height: 350px;
  background-image:url(http://read.html5.qq.com/image?src=forum&q=5&r=0&imgflag=7&imageUrl=http://mmbiz.qpic.cn/mmbiz/jYVY58x65QgvLU6RVkj81CWN1HI1F6DVWibNczicqmrX1a0Hmeb8FicZOOZ8Gia7Kib67M9Dw6QKjZhEcya93c2ia7zA/0?wx_fmt=gif), url(https://s-media-cache-ak0.pinimg.com/originals/fa/6c/d2/fa6cd2d0ff6f0b0f6b89537b7d608a00.jpg);
  background-blend-mode:screen/* will only affect background */
}
<div class="header">
  <div class="snow"></div>
</div>

Keep in mind that browser support for these features may not be extensive, so consider using SVG as an alternative (here's a useful link).

An easy solution is to edit the GIF and make black areas transparent (see example here)

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