Here are two very different versions of M16:
The first is the regular Hubble Palette (R, G, B) --> (SII, Ha, OIII).
http://www.astrobin.com/212657/
Higher res here
http://www.astrobin.com/full/212657/0/
The second uses a palette which gives natural colour (R, G, B) --> (Ha + SII, OIII, OIII +0.25*Ha)
http://www.astrobin.com/212658/
Higher res here
http://www.astrobin.com/full/212658/0/
Telescope: 12.5" Plane Wave CDK
Camera: FLI Proline 16803
Mount: AP900
Exposure: 120 min Ha, 130min OIII, 120min SII
FOV: 49' x 49'
Processing: PixInsight. For the Hubble version I used Rick Stevenson's ColorMask script to desaturate the magenta stars and to push the colours.
Geoff