Steve Cannistra, Light Halo Removal
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Steve Cannistra, Light Halo Removal. Light halos around stars can result from internal reflections. Steve Cannistra, Light Halo Removal. Setting up the technique in Photoshop:. 1. Use the Elliptical Marquee tool to draw a circle around

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Steve Cannistra, Light Halo Removal

Light halos around stars can result from internal reflections.


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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.

  • Select curves (Layer, New Adjustment Layer, Curves).

  • You will now have the curves window open, with a mask

  • that selectively permits the star halo region to show through

  • (see next slide).


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Steve Cannistra, Light Halo Removal

Light halo to be removed

Curves window

Mask


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Steve Cannistra, Light Halo Removal

Removing the light halo is accomplished by the “inverted S”

technique (patent pending <g>):

1. Bring the midrange of the curves downward.

  • Bring the low end of the curves upward.

3. Bring the high end of the curves downward.

  • Tweak it to look like this (next page):


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Steve Cannistra, Light Halo Removal

The “inverted S”

Final image with halo removed/attenuated