How can I find the transform function, amplitude and frequency response of a digital filter in python?
Assuming each element is the filter coefficients for the R, G, and B channels (I do not know if this is indeed the case here), you can get the frequency response of each channel using scipy.signal.freqz:    

scipy.signal.freqz(c, 1, v)


Where c is the filter coefficients and v is the signal data for that channel.