Sitepoint Members,What do you think compresses color jpg images the most; Photopshop, Adobe, some Microsoft software?
Paint.NET makes a GREAT job and it's FREE.
I recommend to use 91% compression rate.
Paint.NET it's very simple, but just for compression is perfect.
I just use GIMP, it gives you a few compression options.
I've been using RIOT - Radical Image Optimization Tool the last few days and it seems to work best for the image I was working on, and it's free.
I'd reccomend PAINT.NET, very simple and good for compression.