I found a miracle in using the .tiff to save images without color loss...although you can read more about it from the given link ;p
Now you're probably wondering what server would even upload such a file?. The answer is simple and found in a little site a few of you probably know of by now called...Flickr ;)
Even better news is...Flickr can connect to your Blogger blog by posting your Flickr image and thus it enables you to post a Blogger entry through Flickr (did you get all that?!), good stuff :)