RGB combine

[m.shemuni]

Hi everyone.

I have 3 grayscaled picture. These are Red, Green and Blue filtered.
I want to colorize it.
I'm a GNU/Linux user and I did it with imagemagick using this code:

convert r.png g.png b.png -set colorspace RGB -combine -set colorspace sRGB rgb.gif

But I want to colorize it with using color matrix. For example I want it to looks more red or blue. I remember something from fits liberator. I was able to change density of colors.
How can I do it with python?
Sorry for bad English.