blend_soft_light(self, rgb, intensity)
An MxNx3 RGB array of floats ranging from 0 to 1 (color image).
An MxNx1 array of floats ranging from 0 to 1 (grayscale image).
An MxNx3 RGB array representing the combined images.
Combine an rgb image with an intensity map using "soft light" blending, using the "pegtop" formula.
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