Get the French DVD release. Both domi and durix are correct. The American DVD release is a washed-out black & white, dubbed version. My wife and I still enjoyed it though. The plot, music, and the presence of BB made it possible to overlook the American-released DVD production problems.
The French DVD release is the one you must get. The French DVD provides the original rich colors and a crystal clear soundtrack. BB looks beautiful in hot pants, an evening dress, and not once but twice in a tub. No English subtitles though--which is a frustration I have with many French DVD releases.
The attempt at creating a "mod" Paris not unlike mod London of the 60s is a hoot, and the contrast made between it and the French countryside is obvious but never forced. Bardot's flirtations toward the cellist Gaspard will charm you.