How to Use the Black & White Adjustment Layer in Adobe Photoshop
See Adobe Photoshop: Tips and Tricks for similar articles.
The Black & White Adjustment Layer allows you to easily make a color image appear grayscale and then apply other effects from there.
This feature works the same in all recent versions of Adobe Photoshop: CS5, CS6, and Creative Cloud (CC).
- In the Layers Panel, click the Adjustment Layer button
and select Black & White. - In the Adjustment Panel, check the box for Tint. The tint option creates the illusion of a duotone image.

- Click the swatch next to Tint to open the Color Picker. When the Color Picker opens, adjust the RGB color values to choose your desired tint color, then click OK.

- Uncheck Tint to return to the grayscale version.
- Press the letter D on your keyboard to reset your foreground and background colors to black and white.
- Click on the layer mask thumbnail on the Black & White 1 layer in the Layers Panel to make it active, which is indicated by the corner brackets around the thumbnail.
- Select the Gradient Tool
. In the image below, we went to the right edge of the image, then held down the Shift key to keep the direction horizontal while dragging straight across to the left edge of the image. This technique reveals color on the left side of the image. 
