夜景照明中颜色的退晕推移方法

着重介绍了夜间照明中利用颜色变化来体现建筑立面泛光照明的层次感，颜色的退晕推移处理手法是达到这一目的的好方法。由建筑物表达的颜色相协调原则选择了投射光源后，可根据物体色的色品坐标计算方法，算出经过外墙表面反射后三刺激值大小和色品坐标。在本文中考虑了外墙表面各点处投射光和反射光情况差别产生的影响，建议了一个逐步逼近的计算方法：可先算出楼身上部和下部垂直线上两点处色品坐标，再调整投光灯位置的灯具，直至更换光源等，尽量使垂直线方向上各点处色品坐标落在上述上下两点色品坐标；色度学连线上或附近，从而实现颜色的退晕推移效果。

Color Lapse by Halo Retreat for Night Landscape Lighting

This paper focused on making use of color change to incarnate hierarchy of floodlighting of the building facade in landscape lighting. Color lapse by halo retreat is a good method to reach this goal. The projection light source was chosen on the principle of building exterior color coordination. According to the computing method for chroma coordinates of object color, the magnitude of three stimulus values after reflection by external wall surface and the chroma coordinates were calculated. The purpose of this paper is to take account of the influence of difference between projecting light and reflecting light on external wall surface. At the same time, an approximating computing method is recommended, that is, first figure out the chroma coordinates of two points--the top and bottom points in vertical line of the building and then readjust the location of casting light lamp and lighting fitting or renewal the light source. Then let the chroma coordinate of ever point on the vertical line settle in or be near the line connecting the two points of chroma coordinates on CIE 1931 Chroma chart. It would yield good results due to the color lapse by halo retreat.