retrieval of original image from its bit planes

I have eight different bit planes of a image i.e. bp0-bp7 and now i just want to retrieve original image by combining all these. how it is possible..please suggest.

Answer 1

[Guillaume]

%bitplanes = randi([0 1], 100, 100, 8); %random array of bit planes
bitplanes = cat(3, bp7, bp6, bp5, bp4, bp3, bp2, bp1, bp0); %assuming bp0 is lsb
bitweight = permute(2.^(7:-1:0), [3 1 2]);
fullimage = sum(bsxfun(@times, bitplanes, bitweight), 3);