How to search for images with transparent backgrounds

Google recently started indexing SVG files;

http://googlesystem.blogspot.com/2011/01/google-image-search-indexes-svg-files.html

It should be there as a 'filetype' option in the advanced images search;

http://www.google.com/advanced_image_search

This might also be useful;

Find SVG vector images with Google Search

Hope this helps.

There doesn't seem to be any way to save Google Image search preferences, even when logged in to Google, which is a bit strange. I would have thought this would be something that a lot of people would use.

Anyway, you could probably create a little piece of JavaScript and add to your toolbar as a bookmarklet to do this.

Something like this would work:

javascript:(function() {  
var searchTerm = prompt("Enter search term:","");
searchTerm = escape(searchTerm);
var url = "http://www.google.com/search?q=" + searchTerm + "&tbm=isch&hl=en&cr=&safe=images&orq=dog&tbs=isz:lt,islt:vga&biw=1280&bih=";
window.location.href = url;
})();