Abstract
Two experiments were carried out to determine signboard color modification rules for a harmonized streetscape in which signboards are visible and the identity of logos is clear. Various color-modified logos were displayed in the first rate their impression. It was found that it is preferable to maintain the hue of the logos similar to that of the original in the experiment 1. It was suggested that retaining the original hue of logos on signboards improves their visibility and makes the streetscape aesthetically appealing from the experiment 2.