Chromatic Aberration
lateral chromatic aberrationlongitudinal chromatic aberration
Chromatic aberration in chromatic aberration cinematography is color fringing from different wavelengths focusing at different distances or magnifications. Lateral CA puts red-cyan (or similar) fringes on high-contrast edges, worse toward the frame edge, while longitudinal CA puts different colors in front of and behind the focus plane.
Narrative function
Cheap, wide, or vintage glass fails to put all colors on the same plane. A branch, a shoulder, a neon sign grows a red or cyan beard.
The optic is imperfect on purpose, or it is simply old. Use it when the glass should confess: lo-fi night, a dream that is optical rather than a grade, a wide at full aperture.
Tie fringes to contrast edges, stronger in the corners. It is the wrong tool as a full-frame RGB split, which is a channel offset, not aberration.
If the whole image is three layers of the same picture, you have a digital treatment, not CA.
How it works
Wide angle, wide open, simple or vintage designs. Lateral CA scales with distance from center.
Longitudinal CA shows as color bokeh (magenta in front, green behind, or the reverse). Recreate by fringing high-contrast edges, not by sliding entire channels.
Prompt: red-cyan fringing at high-contrast edges, stronger at the frame edge, cheap or vintage glass.
When to use it
A night overpass, raincoat against neon, red-cyan fringes on the brightest sign edges and the silhouette. Do not RGB-split the entire figure as if it were a channel offset.
Compared with similar shots
Lens Flare is scatter and ghosts, not edge fringes. Fisheye is extreme barrel distortion.
It can carry CA but is a geometry, not a color error. Vintage Cine Glass often includes CA plus haze and vignette.
Distortions are spatial warps. CA is a color-focus error on top of, or instead of, those warps.
In film
Spring Breakers lets cheap-looking fringing and analog error sit on party lights. Music videos often push lateral CA as a wide-open night look.
Enter the Void uses optical error as subjective night, which is grammar, not a template.
Prompt it
Fringe the edges, do not split the body. Example: Chromatic aberration on [Subject], red-cyan fringing at high-contrast edges, stronger toward the corners, vintage or simple glass, not a full RGB channel offset.
What usually goes wrong
Wrong cousin: RGB split, lens flare, or fisheye stretch. Tell: the whole subject is three colored copies, or only a rainbow streak with no edge fringe.
Fix: confine color to high-contrast edges, increase it off center, keep the core image registered.
Questions
What is chromatic aberration in film?
Color fringing from wavelengths that do not share a focus or a magnification. Lateral CA beards edges. Longitudinal CA colors the blur in front of and behind the mark.
Chromatic aberration vs lens flare
Flare is stray light making ghosts and veils. Chromatic aberration is a focusing error that puts different colors on contrast edges. One is scatter. The other is dispersion.
When should I use chromatic aberration?
When the optic should look imperfect: vintage glass, wide night work, a slightly untrustworthy image. Do not use a full-frame channel split.
How do I prompt chromatic aberration for AI image or video?
Ask for red-cyan (or named) fringing on high-contrast edges, stronger at the corners, from cheap or vintage glass. Ban whole-image RGB offsets.
Melies can generate this Chromatic Aberration
Melies is the AI filmmaking workspace. This Chromatic Aberration opens with the optical prompt loaded, so the effect has a physical cause in the frame.