img=imread('C:\Users\GWL\Desktop\arun.jpg');
imshow(img,'Border','tight');
frame=getframe(gcf);
% method 1
imwrite(frame.cdata(:,:,1),'test.png');
% method 2
imm = frame2im(frame);
imwrite(imm,'test2.png');
imshow顯示圖片
test.png(灰度圖像)
test2.png




