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I did a simple principle a little while ago by placing coloured filters on the screen to isolate RGB and refocus. This method was not the best but had some merit.
Digital filtering would be much more precise admittedly and would be highly effective low cost filtering method. The only negative could be the sharp roll-off of the colours being filtered and may produce some unknown issues when re-combining (I hope not).
It was pointed out though that colour camera place filters over each pixel so pixel reduction is noticed with digital filtering. I experimented and confirmed this as in most cameras Green uses twice as many pixels than Red and Blue. My results showed very grainy quality of Red and Blue compared to green. I suppose the final result will be no different than taking a single colour exposure anyway so I suspect it is a mute point.
In saying this the issue of focusing Digital filtering would be very good and I feel extremely economical, but mono imaging with filters will produce the sharpest images and more accurate RGB combination, but at his stage is very expensive.
Initially I could really use digital filtering.
I am only typing with one arm so please excuse the the way i have expressed this reply.
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