Abstract
The aim of this study was to develop objective criteria for the evaluation of the interior color impression using images. The object of the study were welfare facilities in Miyagi prefecture. New parameter named "mean color" is used. The calculation and analysis of this parameter was possible due to the current level of computer equipment. The validity of the parameter was investigated in experiments. The subjective evaluations were in correlation with the computer measurements, which proves the impact of the selected factor upon the human perception.