Image links?

Im sure this has been discussed, but I was wondering if image links count as much as text links. I have alot of links that are images and I was wondering if I should get them switched over. Does it make a big difference with google PR?

 

You heard right- text links are better.

 

I did some experiment a while ago, not so sure if it is still true, but on a lonely PR4 page, I put 2 links, both images, 1 sized 400x400 with a link to a sub-page and 1 sizeo 20x20 to another page. Both pages have no other incoming links.
the first page got PR3 after the update which sounds normal, compared to a text-link, but the other one got PR2

Both links did have 3 words in the ALT="aa bb cc" tag.

With or without PR-influence, if you must link with an image, make sure you have good ALT - texts for these images!

 

To sum it up, text links are better, and good alt text in image links is better than nothing.

 

could anybody please expplain why this is so

 

Why what is so? Why text links are better than image links? Because the SEs have decided so.