matlab 保存图像去白边

如果为图像矩阵可以用如下代码

imshow(im1,'border','tight','initialmagnification','fit');  
set (gcf,'Position',[0,0,875,656]);  
axis normal;
saveas(gca,'1.bmp','bmp');

如果为自己写的矩阵可以用如下代码

C = [1 2 3; 4 5 6; 7 8 9];

imagesc(C);

set(gca,'position',[0 0 1 1])

grid off

axis normal

axis off

saveas(gcf,'pic','jpg');