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 right.
Sharpless 157, the
Claw Nebula, is a bright emission nebula in the constellations
Cassiopeia and Cepheus at a distance of about 8,000 light-years. At
the bottom-right is the open star cluster NGC 7510, about 9,900
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.