Black & White Look Request

### Feature Request I'd love to suggest an option for black and white looks in addition to color. A switch to allow either color or black and white looks through the Spectra look generation tool would be amazing, as well as some pre-baked options ### Use Case As a photographer who has shot a lot of B&W film, it's a special look that Color.IO could do a great job achieving. And I'd love to be able to pull through that classic film look you achieve into my video work with BW options as well. Nailing the contrast curve just right can be tricky, and being able to iterate via Spectra and dial it in through the control panel would be a great feature.