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Originally Posted by nebulosity.
Nebulosity provides a few debayer options: Colour Binning, Bilinear, VNG, PPG, AHG. Which would give me the best results?
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Colour Binning is, if I'm not mistaken, the choice to not interpolate at all and obtain an image at a quarter of the native CCD resolution. If you can live with that, this is what I would recommend.
If you don't like that then I'd recommend Bilinear interpolation because this simple scheme introduces the least artifacts. The other schemes are progressively 'clever' and will introduce artifacts that stacking may not be able to overcome.
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Here is the same RAW image opened in (1) Aperture, (2) Nebulosity, (3) and debayered in Nebulosity. (VNG)
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In reality they are probably not so different and merely have different things applied to them;
(1) is really (2) debayered and stretched but (probably) not colour balanced.
(2) is the raw data as it comes from the CCD. If you zoom in you will notice a checker pattern due to the bayer matrix (not visible in the JPEG).
(3) is the raw data from (2) debayerd - the checker pattern should now be gone
(4) is (1) but colour balanced
That's my guess anyway.