Colour compositing doesn't match Unity's compositing due to colour space #54
Description
The Unity project is set to do colour compositing in linear colour space, but we currently do it in gamma space, causing the results to differ.
This isn't an issue at the moment, but will be if we ever want to overlay sprites and have the composited colours match how they would look in an image - e.g. if we ever render layers to their own sprites.
The easy solution is to change the Unity project's settings, but this doesn't work if we ever add a setting to choose what colour space to do compositing in, because I don't think you can change Unity's colour space at runtime.