Arto KAARNA received his M.Sc.degree in mechanical engineering in 1980, Licenciate of Science degree in information technology in 1990, and Doctor of Science (Tech.) degree in information technology in 2000, all at Lappeenranta University of Technology, Finland. He is currently an associate professor (tutkijaopettaja) at the Department of Information Technology, LUT. His main research interests are in digital image processing and in colour science. The latest studies relate to the illuminations effects on similar colours. He has published 100+ articles in scientific conferences and journals. He is a member of Pattern Recognition Society of Finland (member of IAPR) and Institute of Electrical and Electronic Engineers (IEEE).