B&W render of someone else's photo by request.

Processing:

Original RAW data multiplied by 8 to get a bright 16-bit TIFF, and a better space to interpolate color planes

Data interpolated into RGB color planes (no white balance applied).

Blackpoint of 1024 (8*128) clipped to 0.

Saved out as 16-bit TIFF.

Loaded into PS, Channel mixer in mono mode 200% red, 100% green, -50% blue (approximately, by memory).

"Curve" pulled up into upper left corner.

USM of 0.5px, 150%.