Subtractive Process: Photographic process that uses one or more subtractive primary colors i.e., cyan, magenta, and yellow, to control red, green, and blue light.

• 减色法照明：这种技术主要应用在现有的光源下进行室外拍摄。通过使用大张档光板，柔光布，或吊灯,使光线从被摄主体移走，目的是增加光比。有时候称为“负补光。”