The differences shown can be subtle in some cases. Viewing the images using a low quality display or difficult lighting, a display that has not been calibrated or profiled, a browser that is not color-space aware, etc all will work against you.
Comments are always based on the 16-bit TIF files viewed in Adobe Photoshop CS4 (using an 30" Apple Cinema Display). Readers with advanced hardware that can display the full AdobeRGB color space might see additional differences that I was not able to discern.
I’ve carefully examined the images on my system in uncompressed form, and taken care to provide them in a form which is not distinguishable from the original by eye, at least on my system. I’ve also checked that there are de minimus differences between originals and the JPEGs by using the Photoshop “Difference” calculation.
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Firefox 3 Add-ons window showing the Color Management plugin