Distort or convolve an image
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. |