Photoshop ZigZag Filter on Radial Selections

The ZigZag filter in Adobe Photoshop applies a concentric ripple effect to radial selections, mimicking the natural visual distortion of waves across a liquid surface. This article explains the specific visual styles generated by the filter, how its three displacement modes behave within a radial selection, and how adjusting its core parameters alters the final aesthetic.

The Core Visual Style: Concentric Liquid Ripples

When applied to a circular or radial selection, the ZigZag filter distorts pixels into undulating, concentric wave patterns that radiate from a central point. Visually, it simulates the effect of dropping a stone into a still pond, creating peaks and troughs that warp underlying textures, lines, and colors into fluid, concentric rings. Depending on the settings used, this style can range from soft, organic water ripples to sharp, dynamic shockwaves or rotational vortexes.

The Three ZigZag Modes

The exact visual style of the distortion is determined by three distinct style options within the filter dialog:

• Pond Ripples: This is the most common water-like style. It displaces pixels diagonally toward the top-left or bottom-right, creating soft, realistic highlights and shadows that replicate the natural surface tension and refraction of water waves.
• Out From Center: This mode displaces pixels directly toward or away from the center point of the selection. Visually, it produces an explosive, radiating shockwave effect, pushing pixels radially outward in sharp crests or pulling them inward toward the origin.
• Around Center: Rather than expanding outward, this style rotates pixels symmetrically around the selection's center anchor. It creates a swirling, vortex-like ripple that twists detail in alternating clockwise and counterclockwise bands, resembling a whirlpool or a spinning liquid funnel.

Controlling the Wave Appearance

Two primary parameters dictate the visual intensity and density of the radial style:

• Amount: Determines the amplitude of the waves. A positive value pushes pixel displacement in one direction, while a negative value inverts the displacement (flipping wave crests into troughs). High values yield intense, jagged distortions, while low values produce subtle, glassy refractions.
• Ridges: Dictates the frequency of the ripples from the center of the radial selection to its outer edge. Lower ridge values generate wide, gentle swells, whereas high ridge values create dense, closely packed concentric rings resembling high-frequency soundwaves or fine liquid vibrations.