Does the forum image upload engine modify/compress images on upload, even if they're under the kB limit etc? I'm sure the quality/sharpness of images uploaded is less than my originals and can't figure out why. Eg this is a link to 800px wide recent image direct from my website, and compare that to the uploaded one below. They should be identical.
http://piggo.com/~troy/photos/2009/2009_12_20/troypiggo_4180.jpg