试验一 matlab读取图像

clear all, close all;

path=‘C:\Users\Administrator\Desktop\‘;

file=strcat(path,‘t1.jpg‘);
I1=imread(file);
imshow(I1);




%将I1以0.1（或0.3）的压缩比储存
imwrite(I1,strcat(path,‘t2.jpg‘),‘Quality‘,10));
imwrite(I1,strcat(path,‘t3.jpg‘),‘Quality‘,30));

%绘制I1 R G B 三个通道的直方图
figure(‘color‘,‘white‘); imagesc(I1(: ,: ,1); colormap([(0, 1/255, 1)‘,zeros(256,1),zeros(256,1)]); axis=off;
figure(‘color‘,‘white‘); imagesc(I1(: ,: ,2); colormap([zeros(256,1),(0, 1/255, 1)‘,zeros(256,1)]); axis=off;
figure(‘color‘,‘white‘); imagesc(I1(: ,: ,3); colormap([zeros(256,1),zeros(256,1),(0, 1/255, 1)‘]); axis=off;

%绘制不同通道的直方图
figure(‘color‘,‘white‘);
for i=1:3
    subplot(:,:,i);imhis(I1(:,:,i));
    title(strcat(‘r g b channel‘,num2str(i));
end