There is clearly something I do not understand about digital video... A 3 minute movie taken on my Canon G15 camera runs about 600MB and is stored in .MOV format. I can open it in QuickTime Player, of course. When I go to export it, the highest resolution export option is 1080p, and when I export it in that format, the file size shrinks to about 75MB, but it stays in .MOV format. Clearly, information is being thrown away, though I can't see a degradation in quality on a MB Pro screen. Is the original a much higher quality copy and should therefore be kept for archival purposes? How do I determine the quality difference (other than via the file sizes) between that original and the 1080p version?