Use the Colorize command to replace all colors in a selection or an image with a single color and saturation while leaving the lightness values unchanged. You can use this command to create sepia tones (the brown seen in old photographs) and other single-color effects.
Note: The Colorize command creates an image that looks like a duotone (two-color) image. To create a duotone with more subtle color changes, apply the Greyscale command, increase the color depth to 16 million (24-bit) colors, then apply the Colorize command.
Important: To apply this command to a selection, the image must be a 16 million (24-bit) color image (otherwise the command is applied to the entire image). To increase the color depth of an image, see Increasing the Color Depth of an Image.
To colorize an image:
To limit the correction to a specific area, make a selection in the image. See Using the Selection Tools.
Choose Adjust > Hue and Saturation > Colorize.
To colorize the image, modify the following settings:
Hue The hue that all current colors are changed to. Click the slider button and drag the slider to select the color visually.
Saturation The saturation of the selected hue. Click the slider button and drag the slider to select the saturation visually.
Click OK.
Creating Black and White Images