The Carina dwarf galaxy is a notoriously faint object as described at the ESO website. The natural skyglow at Chile where the image was taken is fainter than the surface brightness of the galaxy.
http://www.eso.org/public/images/potw1126a/
I measured the skyglow in the image and subtracted it out. This allowed a more aggressive stretching of the image. The Carina dwarf while still faint is clearly more visible.
The left hand thumbnail is the untouched image, the right hand image is skyglow subtracted and stretched.
Higher resolution images are found at:-
http://users.westconnect.com.au/~sja...arinadwarf.jpg
http://users.westconnect.com.au/~sja...arfprocess.jpg (processed image)
I could have spent more time fixing the brighter star images.
Regards
Steven