I am whats known as colour deficient. I can see most of the spectrum, but the in between shades are a bit iffy for me... it makes colour blending VERY difficult... Essentially, what I did was as follows..
Process Ha data to the point where it looks at its best (this is easy, black and white.. not much can go wrong here)
Process the OSC data to look like other images of the horse head I've seen, this usually gets me close, but not always close enough.. I copied the OSC data as a layer on top of the Ha data, applied a few transforms to line it up (the OSC data was taken at 714mm F/L, the Ha at 480mm.. this part took some time to get right)
Once they were lined up, I set the Ha blend mode to Luminosity, the OSC layer to Colour. I applied slight blur to the colour image to reduce the noise a little and there you have it... HaOSC blend. Probably not the best way to do it.. but it did work.. and that image compared to the Horsehead OSC data on its own is 1000x better..
I personally both prefer the look of tri-colour narrowband images, and think that for me it will be the easiest way to get pleasing results.. Nobody will tell me "your colours are wrong"
haha.. Have a dig through my image threads.. people are always pointing out colour issues, or background green biases etc that I simply can not see... Makes life tricky...
I personally prefer the Ha only images too Mike, despite the noise brought on by lack of total exposure time... I think they are quite effective... I have an OIII filter here to try out in the next few nights.. and hopefully do some NB colour images either H O O or O H O pallete... who knows.. and as you say, an interesting exercise no matter what the result...