Friday, March 16, 2012
Revised Comet C/2009 P1 Garradd near NGC 4236-1 - March 14, 2012
The left image is the result of that process, and the right image had a square root transform applied to it. Compare with the result of stacking just 5 images here. Galaxy detail is better, comet definition cold be better. Compare it with Rolando Ligustri's image from the same night.