Hi,
This phenomenon happens mostly because different codecs (DV, H264...) handle the luminance ranges differently by automatically converting them.
The cure is to use a codec like Animation (QT) or simply go for uncompressed just to mention a few.
If you really need to stick to a certain offending codec then use right before your final render an adjustment layer and apply the levels or curve filter to compensate the washed out look.
I am sure if you search the web for luminance range & codecs that you will find more detailed explanations.
Happy New Year;-)
Serge
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