%% Assumes you're in a directory containing the .pgm files.
%% Saves the images in a uint8 array called 'data'.

filenames = dir('*.pgm');
filenames = sort({filenames.name});

% read the first to see how large it should be
im = imread(filenames{1});
data = repmat(uint8(0),[size(im,1) size(im,2) length(filenames)]);
for ii = 1:length(filenames)
        data(:,:,ii) = imread(filenames{ii});
end