Why do my films look colorful in Final Cut Express, and washed out everywhere else?

I’m trying to export an edited film from Final Cut Express, but when I open it in Quicktime, VLC or QuickLook, the video looks all washed out. When I go into the exporter thing for Quicktime and choose a filter, and select none, it shows the video how it looks in Final Cut Express, why is it doing this and how can I fix it?