Question

matlab的灰度反色

A = imread('cameraman.tif');
A = imread('cameraman.tif');
imshow(A):figure;
m = size(A,1);
n = size(A,2);
for i = 1,m
for j =1,n
B(i,j) = 255 - double(A (i,j));
end
end
imshow(uint8(B));
===================
A为原图，B为反色后的图，这个代码运行后似乎没有任何效果。。
请问如何修改。。谢谢~
汗。。电脑抽风。。今天运行后就没问题了= =

Answer 1

如果是MATLAB的话，循环错了，应该是这样
for i = 1：m
for j =1：n
B(i,j) = 255 - A (i,j);
end
end

Answer 2

p=imread('filename.bmp');
i=rgb2gray(p);%
i就是灰度矩阵

Answer 3

B=255-A(i,j);