Hey Roger, what'd you have to do to the image to get that?
I like using the old Netscape 4.8 because I can have it use an external program to render images that aren't embedded in the page, or I can right-click and select "view image" on an embedded one and it'll pop up in the external program. My external program of choice is the "display" component of the ImageMagick suite. It's actually got interface to all the "convert" component functionality in the unix version, so when an image like Butch's shows, I hit shift+g and get a gamma modification dialogue.
Here's shift+g [enter] for a default-value gamma correction of 1.6: