If you want to create beautiful, richly toned black-and-white versions of your photos, you can use the Monochrome Mixer to get exactly the look you want.

1. Select the photo you want to convert and make sure the Adjustments pane is visible. (If it isn’t, choose View > Inspector > Adjustments.)
2. Click the + button near the top of the Adjustments pane and choose Monochrome Mixer from the pop-up menu. This adds the Monochrome Mixer adjustment control near the bottom of the Adjustments pane and applies the default monochrome filter to your image.
3. Try using one of the filters from the Preset pop-up menu on the Monochrome Mixer to quickly refine the black-and-white conversion. You can apply the Monochrome with Red Filter, for example, to add deep contrast to blue skies.
4. Fine-tune your results even further using the individual Red, Green, and Blue channel sliders to “mix” a custom black-and-white conversion that produces the effect you’re looking for.