Hi.

I have an illustrator file, with a vector logo, I can resize it as I want and its looking great.
Now I need to save it for web use, I have saved it as 250px X 250px regular file (100%) in png-24 and 128gif and 256gif its looking fine on a PC/Mac browser.
But when I look at it on a tablet/iPhone/iPad it's get blurred image / logo edge, I have tried to save it for "web use", in png-24 and 128gif and 256gif with a (200%) size, but I still get a bad file to retina, and the illustrator vector file is looking fine, what do I do wrong when saving to/for retina use ?