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amp88Wow, 20megs. I hadn't realised it would be that big...
Well, as you say, there's considerably more detail on the higher res picture, but it does take more time to view the component images (zooming and scanning the final image takes longer). Now that I've had a chance to look at the two side-by-side, personally I feel keeping it at the 40x40 is the better move. It's more true to the format of a photomosaic, as you say, but there's still plenty of detail (at least to my eyes).
Yea, I didn't realize there would be such a difference in file size. When I first saw that it was 20 megs, I thought I accidentally saved it as 12,800x9,600! But they are both 6,400x4,800. I think it has something to do with the way images are compressed...the fewer drastic changes (like the border between images), the better, maybe. It also might have something to do with the fact that I used a different program to splice the 4 parts of the 80x80 together and it may save at a different quality setting than the original render. If that's the case, then coding it into the program instead of splicing them externally would reduce file size.