Halation

Halation is the warm, often reddish glow that spreads around intense highlights, originally caused by light passing through film emulsion, scattering off the backing, and re-exposing the surrounding grains. On film it shows up around practical lights, windows, and specular hits. Editors and colorists recreate it digitally to make footage feel organic and filmic, since pure digital highlights can look clinical. The typical technique isolates the brightest parts of the image, blurs that layer, tints it toward red or orange, and blends it back over the picture. Applied with restraint, halation softens harsh edges on lights and adds a nostalgic, cinematic warmth. Pushed too far it smears the whole image, so the craft is keeping the glow tied to genuine highlights and subtle enough to feel real.