Image Scaling

Why are we still tied to low-res bitmaps? All I wanted to do was add my photo to my blog but I ended up burning an hour fiddling with pixels. In the end, there are still scaling problems. The template for my blog is 80 pixels tall but the blogger profile page wants one that is 113 pixels tall. I can't give them two different bitmaps so I need to choose between a jaggy scaled-down version on my blog or a blocky scaled-up version on my profile. Why can't I just give them the 2MB original and have them do nice bicubic interpolation to take it to whatever size they need? Perhaps IE 7 and Firefox can do bicubic scaling for all IMG tags where the width and height attributes differ from the image source data.