CCDStack, Photoshop CS w/ the Fits Liberator plugin and Noel Carboni's actions.
CCDStack to register,
normalize, data reject & combine.
North is to the top.
The emission nebula on the left is famous partly because it
resembles Earth's continent of North America. To the right of the
North America Nebula, cataloged as NGC 7000, is a less luminous
nebula that resembles a pelican dubbed the Pelican Nebula, cataloged
as IC 5070. The two emission nebula measure about 50 light-years
across, are located about 1500 light-years away, and are separated
by a dark absorption cloud. This image, captured with a
hydrogen-alpha filter, shows the extent of the hydrogen gas. It is
still unknown which star or stars ionize the hydrogen. The nebulae
can be seen with binoculars from a dark location. Look for a small
nebular patch north-east of bright star Deneb in the constellation