If you’re familiar with black and white photos on magazines, you might be confused whether it is really a black and white image. Sometimes you’ll notice that color is closer to brown or pale yellow.There’s an easy way to create this effect, duotone process.
Duotone, from word duo, means two colors. This is often used in making monochromatic print. It is done by adding a color tint to black and white images. Black ink and gray ink are used to smooth out or allocate different color to specific part, and increase tonal range from lightest to darkest.
Duotone also covers monotone, tritone and quadtone. Monotone, from word mono, refers to images that have only one color. Tritone images are those that use three colors. Images that contain four colors are known as quadtone. Tritone and quadtone images primarily use Overprint Colors button. This will allow you to control interaction of your ink.
To access Duotone, go to image, then to Mode, and select Duotone. If you are using RGB or CMYK, you will have set your workspace to grayscale first. To do so, select Image, go to Mode and choose Grayscale.
Next, select Image, then Mode, and then Duotone. A dialog box will appear. It is where you have to select colors you want.
Open Color Picker by clicking on color swatch. Then, click on Custom button. A pop-up menu will open. Select type of ink and choose color.