Lines and shapes

We usually say black and white meaning grey scale. Indeed grey occours more often in black and white images then black and white themselves. Greys give a single pixel many options, so the whole image is far more complicated then a two colours one. I'm trying to reduce the ammount of useless options towards the least number of variable needed. Greys turn closer to white or black, just a few of them remain because still a bichromatic image would be too flat. The question is, what happens when i do that? It appears to be just like a high-pass filter that emphatizes the areas of the images where the passage from black to white (and viceversa) is fast enough. So it erases countless informations that to my eyes are just redundancy, and it keep the attention to the essence of things. Lines like those created by light or shapes like those belonging to the objects themselves, that's the essence of this path. Still, that's a way to do things, it's not enough itself. There must be a reason behind every photo in this path. It's not enought emphatizing shapes if shapes are useless, and it's very dangerous erasing informations when they're more then simple redundacy.

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