A small repro.
I stumbled across Richard Crisp's website and his page about Synthetic RGB.
In the original image above the data in the Green and Blue channels is identical (Both 100% OIII)
With the synthetic RGB image below, I have added 15% Ha data to the OIII data in the blue channel, this is supposed to emulate the Hydrogen beta emission of the nebula and better emulate a true RGB image.
I have however apparently slightly increased noise, decreased detail and blown the stars out a tad in my processing somehow.
More information at Richard Crisp's page,
http://www.narrowbandimaging.com/synthetic_rgb_page.htm
and this at Starizona's page:
http://starizona.com/acb/ccd/softwar...orenarrow.aspx
From the Starizona page:
"The effect of having H-beta in an image is to tone down the pure red color of the H-alpha emission (which is the dominant emission in most nebulas), turning it into the familiar pinkish or magenta hue of nebulas in RGB pictures."
Not sure which I like better.