In the Type dropdown, select Monotone, and click the Edit button to change the color (by default, Pantone Process Black) and choose another color if needed.
There are four options available in the dialog box, depending on the amount of inks you’re using: Monotone (one single ink), Duotone (two inks), Tritone (three inks) and Quadtone (four direct inks) The original color mode of the image does not matter. To bring up the control panel go to the main menu select Bitmap then find Mode in the dropdown, then click Duotone. To start open a photo or bitmap in CorelDRAW. The result is different from what you would get with mix of colors (RGB or CMYK).
Generally, 'Duotones' images are made by one or more direct color tones, such as Pantone inks. There are many ways to change the color of images in CorelDRAW Graphics Suite and I encourage you to look around and experiment with the tools and effects available in the software. I will be outlining some of the tools I use, but this is not an exhaustive list. This tutorial will show you some different techniques to modify the color of images in order to achieve your desired result. There are many ways you can manipulate the color of images in CorelDRAW® Graphics Suite.