The measurement accuracy of a radiation pyrometer is essentially determined by the emission properties of the object being measured. When the emissivity is not known or is not constant, fairly large measurement errors will result, particularly during measurements on bright metal surfaces. In this paper a radiation-measuring procedure is presented which automaticaly detects and corrects the emissivity. This procedure involves the use of a multispectral pyrometer consisting of a measuring head and a computer. The emissivity correction is accomplished by comparing the received spectral signal with emission signatures stored in the computer.