[IPOL discuss] input image format in demos

[Pascal Monasse]

Hello all,

I have a question about input image format in IPOL demos' python code. It 
seems you can select the format by setting the string app.input_ext (for 
example '.ppm' in graph cuts demo) but that first the images are saved in PNG 
format, and then additional files with required format (here PPM) are 
generated. Is this assumption correct?

Best,
Pascal