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General convolutions
To apply general convolution kernels, use the 
Convolve
operator. You can specify up to a 9×9 kernel in
the node’s parameters, or connect an image to use as a kernel.
Tip
Convolving images is a slow operation, so try to keep the the kernel image smaller than 50×50.
Image displacement maps
Use the 
Deform operator to move pixels based on a
displacement map.
Waves and ripples
You can use slowly animated, smooth noise as the basis for
concentric ripples. Use a cycling 
Ramp node with a
range from 0 to 1 and an interpolation of "Ease in Ease Out" to
create ripples (concentric ramp) or waves (rotated horizontal map).
Create a Deform node and use the noise to
displace the image.
Tip
You should use floating point images for distortion maps whenever possible. Otherwise, quantization errors can cause unwanted noise in the image.