reduction of contrast caused by the non-specular or specular reflection of light from the sign face when light falls on a sign from a source or sources external to the sign

Note 1 to entry: Washout can cause the contrast ratio of the sign to fall below its permitted limit.

Note 2 to entry: This entry was numbered 17-1423 in CIE S 017:2011.

Publication date: 2020-12
Copyright © CIE 2020. All Rights Reserverd.