Morning Doug,

What I have so far is an algorithm that works well with the "natural" filters--L3, 5, and 6--but produces hideous results with L2, and barely acceptable results with L4 as red. All of the test cases you cite have only L2 filters, and at the moment I can't do a thing with them. I still have a lot of work to do!

I'm concentrating on the basic challenge first, which is balancing the channel intensities properly to produce "true color", without worrying too much about absolute radiance (brightness). I think that getting color right is most important, because if you're making a mosaic you can adjust brightness after-the-fact to get a match, without screwing up the color. Eventually I'll merge this software with the software I wrote earlier to produce the Bonneville panorama, which adjusted relative brightness between frames of a mosaic. They're really two separate problems: You can deal with color in terms of hue and saturation, and deal independently with brightness in the luminance channel.

We dont know how much the exposure was changed from image to image - I mean - this would be a godsend for the amatueur mosaic maker if possible - but I cant see how - based on what we get given - one can do that

I'm not ready to go into details yet, but I think the technique is valid for a number of logical reasons; but most importantly because my algorithm produces images that come very close to Justin Maki's standard for "TrueColor(natural)" based on comparison with NASA's press release images. That's pretty good empirical validation, I think. When I have the software refined to the point where it's easy to use and produces consistent results, I'll make it available to the public--you'll be able to use it to construct your panoramas. Give me a couple of weeks, OK?