Multispectral imaging. Several layers per pixel — one channel for each wavelength band.

• Each channel samples a different wavelength range, achieved with different filters over the detectors.
• Stored as a stack: each pixel is a vector of values (one per band).
• Enables band math (ratios, indices like NDVI) and classification.
• Example color film split: 0.4–0.5 µm blue, 0.5–0.6 µm green, 0.6–0.7 µm red.