(IMAGE) Nara Institute of Science and Technology Caption Color compensation procedure. The whole scan takes hours to capture thousands of spectral channels, pixel by pixel. Thus, the image is affected by variations in natural illumination during the scan. The proposed approach includes an extra scan on a single column, which takes only dozens of seconds so that the illumination variation is negligible. By comparing both scans, the approach allows us to determine the variation component during the scan, and use it to compensate for the variations. Credit Takuya Funatomi Usage Restrictions Credit required License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.