Color_Ratio(1)=0.4; %%%% Red
Color_Ratio(2)=0.6; %%%% Yellow
Color_Ratio(3)=0.4; %%%% Green
Color_Ratio(4)=0.6; %%%% Cyan
Color_Ratio(5)=0.2; %%%% Blue
Color_Ratio(6)=0.8; %%%% Magenta
Program:
%%%%% 程序实现图像的黑白调整功能
clc;
clear all;
close all;
Image=imread('9.jpg');
Image=double(Image);
R=Image(:,:,1);
G=Image(:,:,2);
B=Image(:,:,3);
[row, col] = size(R);
Gray_img(1:row,1:col)=0;
Sum_rgb=R+G+B;
%%%% 各种颜色的默认比率
Color_Ratio(1:6)=0;
Color_Ratio(1)=0.4; %%%% Red
Color_Ratio(2)=0.6; %%%% Yellow
Color_Ratio(3)=0.4; %%%% Green
Color_Ratio(4)=0.6; %%%% Cyan
Color_Ratio(5)=0.2; %%%% Blue
Color_Ratio(6)=0.8; %%%% Magenta
for i=1:row
for j=1:col
r=R(i,j);
g=G(i,j);
b=B(i,j);
Max_value=max(r,max(g,b));
Min_value=min(r,min(g,b));
Mid_value=Sum_rgb(i,j)-Max_value-Min_value;
if(Min_value==r)
Index=0;
elseif(Min_value==g)
Index=2;
else
Index=4;
end
ratio_max_mid=Color_Ratio(mod(Index+3,6)+1);
if(Max_value==r)
Index=1;
elseif(Max_value==g)
Index=3;
else
Index=5;
end
ratio_max=Color_Ratio(Index);
Temp=(Max_value-Mid_value)*ratio_max+(Mid_value-Min_value)...
*ratio_max_mid+Min_value;
Gray_img(i,j)=(Max_value-Mid_value)*ratio_max+(Mid_value-Min_value)...
*ratio_max_mid+Min_value;
end
end
imshow(Image/255);
figure, imshow(Gray_img/255);
原图：
黑白
