Spectral imaging is a technique that captures images at different wavelengths of light, allowing for the analysis of materials based on their spectral signatures. This method can reveal information that is not visible to the naked eye, making it useful in various fields such as medicine, agriculture, and environmental monitoring. By using specialized cameras and sensors, spectral imaging can identify the chemical composition and physical properties of objects. It is often employed in remote sensing to monitor land use changes or in art conservation to examine the layers of a painting without damaging it.