CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions
and Russell Croman's GradientXTerminator
CCDStack to calibrate, register,
normalize, data reject & combine the sub exposures.
non-linear stretching and color combine.
North is to the
bottom, it looks better up side down.
All three images were
created using the Hubble color palette. The colors in the top image
follow the spirit of the palette and the hydrogen (green), sulfur
(red) and oxygen (blue) areas can easy be identified. The middle
image was processed to exaggerate the separate areas for the three
elements. In the third image, everything is pretty much thrown out
the window, to produce the popular turquoise and orange motif.