If I’m not mistaken, Adam Savage (Mythbusters, [Tested.com](https://Tested.com), former ILM) has discussed this before and recalled the days where he would have to paint the different layers on the cell and work out what colour it would be based on where it is on the stack. The further down, the more the colour changed, so they’d need to know how many layers the image was and then adjust each layer to colour correct for it.
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