I've got a soft spot for simple, sane formats like this. One obvious but still simple generalization would be to allow n-dimensional image data by encoding the

I've got a soft spot for simple, sane formats like this. One obvious but still simple generalization would be to allow n-dimensional image data by encoding the number of dimensions first, then the size of each dimension, then the data. That would allow representing video (very inefficiently), 3D static images (e.g. from MRI scans), and even 3D video (which is 4D).