s=ltfattext;
ltfattext loads a \(401 \times 600\) black and white image of the word 'LTFAT'.
The image is assumed to be used as a spectrogram with 800 channels as produced by dgtreal.
The returned matrix s consists of the integers 0 and 1, which have been converted to double precision.
To display the image, use imagesc with a gray colormap:
imagesc(ltfattext);
colormap(gray);
axis('xy');