ex4_25.m

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img_tt=imread('tiantan.jpg'); 
whos img_tt

image(img_tt), set(gca,'Visible','off')

imwrite(img_tt,'tiantan.bmp','bmp');

[X,map]=rgb2ind(img_tt,128);

image(X); colormap(map)

[x,y] = meshgrid(-3:0.1:3,-2:0.1:2);
z=(x.^2-2*x).*exp(-x.^2-y.^2-x.*y);

surface(x,y,z,double(X),'FaceColor','texturemap','EdgeColor','none')
colormap(map), grid