A modification of the GPUImageGaussianBlurFilter that operates only on the red component
blurSize: A multiplier for the size of the blur, ranging from 0.0 on up
Simulates the refraction through a solid glass sphere
center: The center about which to apply the distortion
radius: The radius of the distortion, ranging from 0.0 to 1.0
refractiveIndex: The index of refraction for the sphere
Creates a swirl distortion on the image
radius: The radius from the center to apply the distortion
center: The center of the image (in normalized coordinates from 0 - 1.0) about which to twist
angle: The amount of twist to apply to the image