Wien's displacement law states that the blackbody radiation curve for different temperatures will peak at different wavelengths that are inversely proportional to the temperature. The peak wavelength indicates the spectral region where the most energy is emitted, following λ_max = b / T.

Important distinction: The peak wavelength (where spectral radiance is maximum) does not always correspond to perceived color. The Sun (5778 K) peaks in the green (~501 nm) but appears yellowish-white due to human eye sensitivity and seeing all visible wavelengths together. Objects at lower temperatures emit in the infrared (humans at 310 K peak ~9.3 μm), which is completely invisible to the eye but detectable by thermal cameras. Perceived color depends on multiple factors: the full spectral distribution, eye sensitivity across wavelengths, and context.