TRANSFERRING THE 45 0 SPECTRAL REFLECTANCE FACTOR SCALE/

The accuracy of spectrophotometric measurements is limited by the stan dards that are used to calibrate the instrument. Therefore, the proced ure used in transferring the spectral reflectance factor scale from on e material to another for use in calibration must induce the minimum a mount of error. The Munsell Color Science Laboratory has been transfer ring the spectral reflectance factor scale to calibration materials us ing a statistical method to correct for the most pervasive systematic errors in the measurement process. This method is based on a statistic al procedure in which a set of systematic spectrophotometric errors ar e estimated based on the measurement of seven NIST primary standards a nd corrected in subsequent measurements. The optimization of the spect ral reflectance factor scale to NIST standards minimizes the induced e rror. The average reflectance factor error consistently found between the corrected measurements of the NIST standards and their certificate values have been 0.0006 and the average Delta E (ab) has been on the order of 0.2. (C) 1994 John Wiley & Sons, Inc.