What it does
Traces the light and dark regions of the image as evenly spaced lines, like a topographic map.
Contour lines are one of cartography’s great inventions: a way to print three dimensions on two. Surveyors began joining points of equal depth and equal height in the eighteenth century, and the convention stuck because it encodes so much so legibly, altitude in position, steepness in spacing, landform in shape. That legibility is why the aesthetic escaped maps. Outdoor brands, festival posters, and title sequences borrow contour lines when they want something to feel charted and measured, terrain-like even when the subject is a face.
The effect performs a literal translation of the surveyor’s method. The image’s luminance becomes the elevation model, the tonal range is divided into equal steps, and a line is drawn wherever the image crosses one, so a soft gradient becomes wide, calm bands while a hard shadow edge packs lines together like a cliff face on a trail map. Smoothing the luminance first is what keeps the map plausible: it rolls the pixel-level detail into hills the lines can actually wrap around, and deciding how much terrain survives is most of the art direction.
The drawing itself stays graphic. Lines keep a constant width whether they cross a plateau or a precipice, ink and paper are explicit colors, so the same footage renders as fine-line survey sheet, blueprint, or glow-on-black, and the paper can drop away entirely to leave floating lines over whatever sits beneath. A wobble control roughens the mathematics with a hand-surveyed waver. Applied to video, the terrain is alive: every gesture and light change re-carves the landscape, which is something no printed map ever did.
Signature looks
Survey sheet
Dense fine lines in dark ink on warm paper, the unmistakable read of a printed topographic quadrangle, drawn from a face or a landscape instead of terrain.
Blueprint
Pale lines on deep blue-black, wide level spacing, engineering-drawing calm. The same map with the authority inverted.
Living terrain
Contours floating on transparency over the original footage, re-carving themselves as the light moves. The map and the territory at once.
Try it on your own footage
This effect runs live in the Modulate editor, with layers, effect chains, masks, and keyframes. Free, no signup, nothing to install.
Common questions
What is the contour effect?
An effect that converts an image into evenly spaced iso-lines of brightness, the visual language of topographic maps applied to pictures. Luminance stands in for elevation: each line marks one step of tonal height, lines crowd together where tone changes quickly and spread apart where it changes gently, so the image becomes a chart of its own light.
What do the lines in a topographic map mean?
Each line joins points of equal elevation, so following one keeps you level, and crossing them means climbing or descending. Their spacing encodes steepness: tightly packed lines are a cliff, widely spaced ones a plain. The contour effect keeps that grammar intact with brightness as the elevation, which is why its output reads instantly as terrain.
How do you turn a photo into a topographic map?
Run a contour effect over it: the image’s brightness is smoothed into a tonal landscape, divided into equal levels, and traced with a line at every level crossing. Ink and paper colors set the cartographic style, from survey sheet to blueprint. In Modulate this runs live in the browser, on photos and on video, where the map redraws as the footage plays.
How is contour different from a threshold effect?
Threshold slices the image at a single brightness level and fills the two sides with flat color, one hard boundary. Contour generalizes the idea to many levels at once and draws only the boundaries, as lines, leaving the regions between them empty. Threshold gives silhouettes; contour gives the whole terrain between the silhouettes.
Why do contour effects smooth the image first?
Because pixel-level detail makes terrible terrain. Noise and fine texture would shatter the lines into specks and scribbles, so the luminance is blurred into rolling forms before the levels are traced, exactly as a cartographer generalizes real ground into drawable landforms. More smoothing gives calm, sparse maps; less keeps the terrain intricate and busy.
Related effects
Field effect
Generates an evolving procedural field — drifting clouds, marbled veins, swirling flow, or Voronoi cells.
Metaballs
Melts the image into rounded liquid blobs that flow and merge like drops of ink.
Threshold effect
Reduces the image to two colors with a hard cutoff between light and dark, with optional outlined edges.
Outline effect
Add outlines around your content, from a clean keyline to chunky pixel shapes.