The thermal camera lenses are designed to capture and focus thermal radiation emitted by objects, but they do not produce colors themselves.
The thermal camera lenses captures the infrared radiation and converts it into an image with a color palette assigned to different temperature ranges. The color mapping is usually predefined by the camera manufacturer and can vary depending on the specific camera model or user settings.
The colors on the thermal image represent different temperature levels, with the hottest areas typically displayed as white, yellow, or red. The specific color used to represent the hottest temperature can vary based on the camera and the color palette settings.