An FFGL effect that turns your clip into a ruled copper plate. An engraver can't pick a grey, so nothing here draws one. The line carries the tone, swelling where the picture darkens and tapering where it lightens, until the plate goes solid at black and leaves bare paper at white. The ruling follows the picture's own structure, and a second and third hatch set come in with the shadows.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.