Photoshop CS6, PixInsight and Noel Carboni's actions.
CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures.
gradient removal and the
initial non-linear stretching.
PhotoShop for color
combine & final touch-up.
Noiseware Pro, a PhotoShop plug-in.
North is to the top.
The soul nebula,
(sh2-199, LBN 667) is an emission nebula in the constellation
Cassiopeia. The nebula is about 6000 light-years from Earth.
Both images were
created using the Hubble color palette, with SII, Ha and OIII data
mapped to red, green and blue respectively. In the top image, the
color channels were adjusted so the hydrogen (green), sulfur (red)
and oxygen (blue) areas are easily identified. The bottom image uses
the same filter mapping with adjustments to the channel levels to
create the popular turquoise and gold motif.
The top image only
uses SII, Ha and OIII data. The bottom image has added red, green