ie7 png opacity. is it possible

Question

1) dont use ie8 with option "work as ie7". it lies in this case 2) use clean ie7 or ietester last version

For example test.png can be 50% tranparency jpeg picture. I know 2 methods to use it in ie7:

background-image: "test.png"; filter: alpha(opacity=70)

you will see gray image

filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src="test.png")
  alpha(opacity=70);
background: none;

you will see white image

2 variant came to us from ie6!

example: http://pastehtml.com/view/awfp66p2m.html 1 original. 2 grey background. 3 white progid

ie7 screenshot: http://clip2net.com/clip/m46295/1307529587-cliptj2620-2kb.png

ie6 screenshot: http://clip2net.com/clip/m46295/1307529630-cliptt2620-2kb.png

3 image works perfectly in ie6 and ie8. it means in ie6 and ie8 i can animate opacity using jquery!

Answer 1

I've found this one to be pretty helpful: http://labs.unitinteractive.com/unitpngfix.php

Answer 2

I'm not 100% sure what you mean, but I think this is a known bug in all versions of IE (at least up to 8, not sure about 9): Images with alpha transparency will not show correctly if the element containing them has an opacity value different from 100%.

See this answer for more details: How to make a Google Maps semi-transparent PNG tile layer work in IE8?