I guess what I was trying to get across is that I've never seen any benefit from using title attributes on an image, wheras I have with the alt attribute and I can't find anyone that has.
The other thing to consider is that attributes that are mis-used are sometimes coded into algos as a spam prevention measure - I dont have any proof either way with regards to the title attribute on images, but I do know that the title attribute works great with links and that the alt attribute works great with images
I would have to think that with people trying both roads for many years that if a title attrib on an image helped they would be shown in Googles rankings but I have never seen it show up.
Again - my opinion - is to stick to the proper uses of attributes and tags when it comes to the SEs since they base so much on the W3 standards