Concatenating images (numpy arrays), but they look like HSV images

[Sebastian Schabe]

Robert Kern schrieb:
> Probably, you need to use zeros(..., dtype=uint8). When you use 
> dtype=int, that will result in dtype=int arrays. I suspect that 
> matplotlib is then interpreting that to mean that you want it to treat 
> the input as scalar data (which it will pass through a colormap) rather 
> than an RGB image.
> 

Thanks Robert, that was exactly the problem. Now I'am really wondering 
how one can know such details. Well, with your answer I searched again 
in the mathplotlib documentation and under the function imshow(X, ...) I 
indeed found the hint, that X has to be an uint8 or float array or PIL 
image, but before I hadn't known where to search.

So again, thank you

Sebastian