close?all
clear
clc
rgb?=?imread（‘D:\figures\6.png‘）;figureimshow（rgb）;
r?=?rgb（::1）;
g?=?rgb（::2）;
b?=?rgb（::3）;
rl?=?90;
gl?=?150;
bl?=?70;%可以再小一點

%?blue?=?r<=rl?&?g<=gl?&?b>=bl;%figureimshow（blue）;
%?oran?=?r>=（rl+50）?&?g<=（gl-50）?&?b<=（bl+50）;%figureimshow（oran）;
%?yell?=?r>=（