两张图片lena.png和fiona.jpg转化为灰度图像叠加显示

%overlap two pictures %read pic lena I1 = imread('lena.png'); A1 = rgb2gray(I1); a1 = double(A1(:)); %read pic fiona I2 = imread('fiona.jpg'); A2 = rgb2gray(I2); a2 = double(A2(:)); A=[a1 a2]; x = rand(2,1);%transparency y = A*x; %adjust to the size like I2 I3 = reshape(y,size(I2)); %show pic figure, imshow(I3,[]);
遇到问题 Error using reshapeTo RESHAPE the number of elements must not change. help reshape可知 reshape(X,M,N,P,...) returns an N-D array with the same elements as X but reshaped to have the size M-by-N-by-P-by-...M*N*P*... must be the same as PROD(SIZE(X)).
修改reshape那行代码： I3 = reshape(y,size(A2));