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Is it possible to create a radial alpha gradiant on a CALayer, CGImage, or CIImage? How would one go about implementing this the simplest and quickest way?

To give you an idea of what I'm trying to do, I'd like to fade the edges of a cropped oval image I've cut out using the CIImage crop filter.

Unheilig
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Matt Foley
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  • Possible duplicate? http://stackoverflow.com/questions/5617113/how-to-render-a-radial-gradient-onto-a-new-uiimage-on-an-iphone – atxe Oct 18 '12 at 17:54

1 Answers1

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I would generate the appropriate alpha channel by :

1) use the same oval shape as you already used on your picture. 2) apply a very strong (=large radius) CIGaussianBlur filter on your Alpha channel, to make the edges smooth.

Gael Jaffrain
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