Speed lines
Also written: motion lines, action lines, focus lines, 流線, 集中線
Speed lines are drawn line fields that convey motion or force attention in comics. Parallel lines trailing a subject read as movement; radial lines converging on a point read as emphasis, shock or impact. Manga calls them ryūsen and shūchūsen.
Two different tools with one name
English lumps them together; manga separates them, and the distinction is the whole craft.
Parallel speed lines (流線, ryūsen) run in the direction of travel, usually replacing the background entirely behind a moving subject. They say this thing is moving, and it is moving that way. The subject stays sharp and readable; the world is what smears.
Radial focus lines (集中線, shūchūsen) converge on a single vanishing point. They say nothing about motion. They say look here, right now — a realisation, a threat spotted, a name being said. Put them behind a still face and the panel gets loud without anything moving.
Mixing them up is the commonest mistake: radial lines around a running character make the reader feel the character has been startled rather than that they are fast.
Where the vanishing point goes
For radial lines, the convergence point is the meaning. Centre it on the eyes and the panel is about the character’s reaction. Centre it on the object they have just noticed and the panel is about the object. Place it slightly off-centre and outside the face, and the panel gets energy without pinning attention — useful for general chaos.
Keep the point out of the area you need read. Lines converging directly through a mouth or a speech bubble make both unreadable.
Drawing them so they do not look mechanical
- Taper. Each line should be thick at the outer edge and thin as it approaches the centre. A field of uniform-width strokes looks like a filter, which is exactly why default digital focus-line tools read as cheap.
- Vary the spacing. Irregular gaps read as drawn; perfectly even gaps read as generated. Leave one or two wider gaps deliberately.
- Leave a clear zone. Radial lines should stop short of the subject, leaving a halo of white around the face or object, or the subject drowns.
- Let some overlap the subject in parallel fields. Lines passing in front of an arm sell speed far better than lines that politely stop at the outline.
Alternatives when lines are the wrong answer
Speed lines are not the only way to say fast. Smearing the limb itself, drawing multiple ghosted positions, cropping the figure hard against a panel edge, or simply cutting the movement into the gutter all work, and all read as more modern.
A tone-based blur — a screentone gradient field instead of ink lines — gives a softer, heavier motion, good for something massive moving slowly. Ink lines suit something light moving fast.
Related terms
- Screentone — Screentone is a sheet of pre-printed dots, lines or gradients applied to black-and-white comic art to produce grey values. Originally adhesive film cut with a blade and burnished down, it is now nearly always applied digitally as tone layers.
- Panel — A panel is a single framed image in a comic that shows one moment of the story. Its border marks where that moment ends, its size controls how long the reader spends there, and the sequence of panels is the sequence of time.
- Inking — Inking is the stage where a comic's pencil drawing is redrawn in permanent black line. The inker decides which edges become lines, how thick each line is, and which areas are filled solid black — the choices that give a page its depth and contrast.
- Line weight — Line weight is the thickness of a drawn line, varied deliberately across a piece of art. Thicker lines advance towards the viewer and read as shadowed or heavy; thinner lines recede and read as lit or delicate, which is how flat line art conveys depth.