What is the algorithm of outer glow 'soft '?

I'm trying to implement some effects in C++ for my UI controls. I realized that the Layer Styles Photoshop uses a form of anti-aliasing of the transformation of Euclidean Distance for "Precise" (inner glow and outer glow) techniques.

But what is the method used for the technique of 'Soft' outer glow and inner glow? It seems that this is also used for "Smooth" technique the computation of map of the height for bevel and Emboss.

Pointers would be appreciated!

Wow, thanks for all the help people. After a lot of risk of tearing of hair and some collaborations, I finally thought to it:

(1) make an accounting on the areas that require compositing, based on the offset of the shadow, the morphological expansion and cutting to the destination.

(2) expand the mask to grayscale using a metric of chamfer 5,7,11 (the original G. Borgefors algorithm is adapted). Output 8 bit fixed point.

(3) apply the blur of the box.

(4) apply to the 1 to 1 curved contour function, conversion to 8-bit alpha values in the range 0-255.

(5) fill the destination image using the color of the drop shadow, calculated 8-bit alpha channel, blend mode and opacity effect.

Thanks for nothing!

Tags: Photoshop

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