颜色名称和RGB值RGB = 4色名之间的4色名地图（名称）是RGB三色值（3）对应的字符串名称指定的颜色。如果RGB单元阵列（1xn）的名字然后RGB矩阵（NX3）每行对应的刺激。(COLORNAME Map between color names and RGB values RGB = COLORNAME(NAME) is the RGB-tristimulus value (1x3) corresponding to the color specified by the string NAME.　If RGB is a cell-array (1xN) of names then RGB is a matrix (Nx3) with each row being the corresponding tristimulus.)