image = imread('Im1.bmp');
figure('Name','Original');
imshow(image);


grey_average = (image(:,:,1) + image(:,:,2) + image(:,:,3))/3;
figure('Name','average');
imshow(grey_average);


grey_weighted = 0.3*image(:,:,1) + 0.6*image(:,:,2) + +0.1*image(:,:,3);
figure('Name','weighted');
imshow(grey_weighted);

grey_max = max(image(:,:,:),[],3) ;

figure('Name','max');
imshow(grey_max);

grey_min_max= min(image(:,:,:) , [] , 3) + max(image(:,:,:),[],3);

figure('Name','minmax');
imshow(grey_min_max);



id_grey_avg=size(unique(grey_average));
id_grey_max=size(unique(grey_max));
id_grey_min_max=size(unique(grey_min_max));
id_grey_weighted=size(unique(grey_weighted));

rgb_columns = reshape (image, [],3);