What is the size of the third dimension? If it's 3 then it can be considered a normal RGB color image and you can use impixelinfo() to see the values. If you still want it in a spreadsheet, then I suggest you extract each plane of your volumetric image in a loop and then send that to Excel. If you really, really need the x,y,z values also then I suggest you create an N by 4 array and then write out
[rows, columns, slices] = size(array3D);
array2D = zeros(numel(array3D), 4);
counter = 1;
for z = 1 : slices
for x = 1 : columns
for y = 1 : rows
array2D(counter, :) = [array3D(y, x, z), x, y, z];
counter = counter + 1;
end
end
end
xlswrite(filename, array2D);
