clc;close all;clear 

filename = 'Penguins_720pRGBout.txt';
fid = fopen(filename,'r');
    rgbdat = fscanf(fid,'%x');
    rgbdat = uint8(rgbdat'); %%转换为uint8
fclose(fid);

imglen = 1280; imgwidth = 720;
len = length(rgbdat);
r = rgbdat(1:3:len);
r = reshape(r,imglen,imgwidth);
r = r';

g = rgbdat(2:3:len);
g = reshape(g,imglen,imgwidth);
g = g';

b = rgbdat(3:3:len);
b = reshape(b,imglen,imgwidth);
b = b';

rgbimg = cat(3,r,g,b);
imshow(rgbimg);