I've just put together a film in FCP with a sepia look and when I make it a Quick Time movie it comes out with splodges of bright red, green and blue appearing over bits of the image. I used two filters to get the sepia look: colour correction to take the saturation completely out and make it black and white and then the sepia filter. I've also used a filter to make it broadcast safe as I'm guessing the splodges of colour are a reaction to too much chroma or luma but that hasn't made a difference.

Can anyone help? thanks