This is a narrowband SHO image of IC1396 which has been taken with Sulphur II (SII 671.7 & 673.0 nm), Hydrogen alpha (Hα 656.3nm) and doubly ionised Oxygen (OIII at 500.7 & 495.9nm) filters. The resulting 3 monochrome images have then been combined with the SII being mapped to the 'Red' channel, Hα to 'Green' and OII to 'Blue'. An additional neutral colour 'Luminance' filter has also been used.
Three scopes of varying focal lengths were used to capture 20 hours of data, which were then combined using Pixinsight.
For more information and a higher resolution image see James' Astrobin page.