Ok, ussualy we view a image on browser that a image will show up from top down.
i ever seem that a image preview at a browser that view from blur to sharp.
how can i do that ?
Sometimes you might see the term "Interlaced" used to.
This works with Jpegs nicely, and on PNGs too, but on IE instead of just blurring to sharp, it shows it as a bunch of lines against a dark background that gradually randomly-ish appear. So stick to Jpeg for interlacing stuff.
As far as I have seen ......progressive goes with jpeg
while interlaced goes with gif images.
Both give similar kind of results.
Progressive brings it in layers while intelaced give two layers of altenate pixels.
Hope this helps.