讀取rgba格式的圖片，並且顯示R分量成灰度圖

clear all; mFID = fopen(‘C:\Users\WDJR\Desktop\r.txt’, ‘r’); y=textscan(mFID, '%d ') y=cell2mat(y); m=reshape(y,19204,1080); % m=m’; figure(1); colormap(gray(256)); image(m); ii=0;jj=0; for i=1:4:1920

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