This is one of over 4598 effects generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
To open this filter, you must have Filter Forge 1.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
Duotoning is the process of printing an image with two colors of inks; it allows an image to contain more information than a simple black and white image, which uses only black ink. This filter can give effects like toned black-and-white images: sepia, platinum, silver, and other tones. The filter has one of the inks set to black, and the other color is customizable.
duotone duotoning tone toning two-color split sepia ink bw black-and-white b&w