This black and white conversion method is named for Greg Gorman and Mac Holbert. It is also referred to as the Carr Method after its developer Rob Carr. It is a Luminosity Based method. It gives outstanding results, especially for portraits.
Like other Luminosity Based methods, the Gorman method does not take advantage of the color information in the photograph. It relies entirely on the image's luminosity and intensifies them with Solid Color Toning. Gorman works especially well on fabrics and curved surfaces, and on portraits.
Choosing a different color for the fill layer will add toning to your image.