Ripple

Ripple is a Distortion effect.

What it does

Rings of distortion spread out from a point, fading away with distance.

Parameter	Control	Range	Default	Unit
Radius	Slider	0 to 2000; higher	650	Pixels at composition size
Centre X	Slider	0 to 3840; any value by typing	960	Pixels at composition size
Centre Y	Slider	0 to 2160; any value by typing	540	Pixels at composition size
Type	Dropdown	Symmetric · Asymmetric	Asymmetric	-
Wave height	Slider	0 to 200; higher	10	Pixels at composition size
Wave width	Slider	1 to 400; higher	90	Pixels at composition size
Evolution	Dial	Any angle; snaps every 45° while a modifier is held	0°	Degrees
Wave speed	Slider	-5 to 5; any value by typing	1	-
Mix	Slider	0 to 100	100	Per cent
Blend	Dropdown	Normal · Darken · Multiply · Colour burn · Linear burn · Darker colour · Add · Lighten · Screen · Colour dodge · Lighter colour · Overlay · Soft light · Hard light · Linear light · Vivid light · Pin light · Hard mix · Difference · Exclusion · Subtract · Divide · Hue · Saturation · Colour · Luminosity	Normal	-
Matte	Layer	Any layer in the composition	None	-
Invert	Checkbox	On or off	Off	-
Channel	Dropdown	Luminance · Alpha · Red · Green · Blue	Luminance	-

In the Effect Controls panel:

Matte scales Wave height per pixel: white ripples the full height, grey less, black not at all. Invert reads that matte inverted.

Radius: how far the rings reach.
Centre X and Centre Y: the point ripples emit from.
Type: Symmetric slides each pixel in and out along the radius. Asymmetric adds a sideways component a quarter wave out of step.
Wave height: the largest displacement of a pixel.
Wave width: the distance from one crest to the next.
Evolution: adjusts the phase of the ripple.
Wave speed: how many rings spread out each second.
Mix: how much of the result replaces the original.
Matte and Invert drive the strength of the effect from another layer’s brightness; see Effects.