clear all, close all;

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

file_jpg=strcat(path,\'t1.jpg\');
%读取jpg图像
I1=imread(file_jpg);
imshow(I1);

%读取dicom医学图像
file_dicom=strcat(path,\'ct1.dcm\');
I2=dicomread(file_dicom);
figure;imagesc(I2);
colormap(\'gray\');
dicominfo(file_dicom);

%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

%把图像I1转换为HSV图像，分别显示H S V三个通道对应的图像
I1_hsv=rgb2hsv(I1);
colormap(\'hsv\');
cmap=colormap; cmap=resize(cmap, [256,3],\'bicubic\');
cmap(1,:)=[1.0,1.0,1.0]
figure(\'color\',\'white\'); imagesc(I1_hsv(: ,: ,1); colormap(cmap); axis off; axis equal; axis tight;
figure(\'color\',\'white\'); imagesc(I1_hsv(: ,: ,2); colormap(\'gray\'); axis off; axis equal; axis tight;
figure(\'color\',\'white\'); imagesc(I1_hsv(: ,: ,3); colormap(\'gray\'); axis off; axis equal; axis tight;