Color harmonies: complementary, analogous, triadic
Harmonies are recipes for picking colours that belong together. They are shortcuts, not rules, and knowing what each one does is enough to stop guessing.
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Complementary: maximum contrast
Two colours opposite each other on the wheel. They make each other look more intense, which is why sports teams, film posters and sale banners use them. The trap is balance: split them fifty-fifty and they fight, and the eye has nowhere to rest. Give one of them roughly a tenth of the space and it turns into an accent that makes the other colour sing.
Analogous: quiet and cohesive
Three colours sitting next to each other on the wheel — a blue, a blue-green and a green. They share enough light to feel like one idea, which is why nature reads as harmonious even when it is loud. The risk is flatness: without variation in lightness the whole thing turns into a single wash. Pick one to dominate, one to support, and use the third sparingly.
Triadic and the ones after it
Three colours evenly spaced around the wheel stay vivid while balancing each other, which is why they carry children’s brands and the covers of board games. Beyond triadic you meet split-complementary — an easier version of complementary, with the opposite colour replaced by its two neighbours — and tetradic, four colours in two complementary pairs, which almost always needs one to be muted to survive.
The part to remember
Pick the harmony for the job: complementary to make something pop, analogous to keep things calm, triadic to stay lively without chaos.
See harmonies in real palettes