CCDStack, Photoshop CS w/ the Fits Liberator plugin and Noel Carboni's actions.
CCDStack to calibrate, register,
normalize, data reject & combine sub exposures.
North is to the top.
This image, captured
with a hydrogen-alpha filter, shows the extent of the hydrogen gas.
In true color it glows with the red light characteristic of hydrogen
atoms recombining with long lost electrons, stripped away (ionized)
by energetic starlight.
The Rosette Nebula is
a large, circular hydrogen region located near one end of a giant
molecular cloud in the Monoceros region of the Milky Way Galaxy. The
open cluster, NGC 2244, is closely associated with the nebulosity,
the stars having been formed from the nebula's matter. The Nebula is
about 100 light-years across and is about 5000 light-years away.