Rigo

I'm currently working on a lightpainting project as part of my education, using software from here: 

https://cycling74.com/forums/sharing-is-fun-lightpainting-with-jitter

 To create an interactive screen on which users can paint using a lamp, mobilephone etc.

Anyways, I got it to actually colour the areas in which the light is, but I also want to expand in the sense of colour use. I've tried to merge several matrices using jit.alphablend (so as to create different layers with different colours) but I can´t seem to figure out how to connect it all together. Any helt would be appreciated.

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Matrixes alphablending/merging