1. Steve Cannistra, Light Halo Removal Light halos around stars can result from internal reflections.

2. Steve Cannistra, Light Halo Removal Setting up the technique in Photoshop: 1. Use the Elliptical Marquee tool to draw a circle around the halo. A feather of 2 pixels for the marquee tool is fine. the halo. A feather of 2 pixels for the marquee tool is fine. 2.Select curves (Layer, New Adjustment Layer, Curves). 3.You will now have the curves window open, with a mask that selectively permits the star halo region to show through that selectively permits the star halo region to show through (see next slide). (see next slide).

3. Steve Cannistra, Light Halo Removal Mask Curves window Light halo to be removed

4. Steve Cannistra, Light Halo Removal Removing the light halo is accomplished by the inverted S technique (patent pending ): 1. Bring the midrange of the curves downward. 3. Bring the high end of the curves downward. 2.Bring the low end of the curves upward. 4.Tweak it to look like this (next page):

5. Steve Cannistra, Light Halo Removal Final image with halo removed/attenuated The inverted S