I have Panasonic Lumix DMC-TZ7. I record video in AVCHD format, and have made a few nice outdoor videos using iMovie on MacBook Pro (from 2006 with 2.16 GHz Intel Core Duo). Now I recorded a video under water in a bit dark condition. The video looks ok on Windows PC and on TV when playing the video directly from the camera. But the video is very dark on Mac both in iMovie and in VLC. This makes me wonder if there is something wrong with my MacBook Pro. Would anyone have idea why the video is dark only on Mac and not on other divices?