matlab 提取图片ARGB8888数据，输出到TXT

image = imread('ss.png');  %  读入图片
A = rgb2gray(image);    %  提取A值的矩阵
R = image(:,:,1);       %  提取R值的矩阵
G = image(:,:,2);       %  提取G值的矩阵
B = image(:,:,3);       %  提取B值的矩阵
ranks_R = size(R);      %  提取图片的像素（一个m×n的矩阵）

fid = fopen('ss_ARGB.txt','w');
for row = 1:ranks_R(1)
    for column = 1:ranks_R(2)
        A_b = dec2bin(A(row, column));
        R_b = dec2bin(R(row, column));
        G_b = dec2bin(G(row, column));
        B_b = dec2bin(B(row, column));
        fprintf(fid,'%08s%08s%08s%08s ',A_b,R_b,G_b,B_b);%写入二进制,8表示位数,0表示向前补零
    end
    fprintf(fid,'\r\n');
end
fclose(fid);