Granular control over hue and depth and adjustments to to lightness are possible with this dedicated tool for creation of monochrome pictures.
The Monochrome Controller is a specialized tool for transforming your photos into monochrome images. Hue and depth filters can be applied to individual color channels, and eight parameters for adjusting lightness by color. Beginners to monochrome photography can learn about the effects of color transformations by being able to switch between color and monochrome previews.
Adjusting Filters and Lightness to Color Channels