Color Manipulation Tools An example of a tritone can be seen in this portrait of a young girl and her llama in Peru. In any of these modes, duotone, tritone, and quadtone, you can manipulate the contrast (using levels) and use the burn and dodge tool to alter specific areas of the image. But all the color tools, such as hue/saturation and color balance, are unavailable in grayscale. However, you can convert the portrait back into an RGB document by choosing Image > Mode > RGB color. The tonality of the image doesn’t change at all, but now you can use all the of color manipulation tools. Other Color Options In addition to traditional duotones, you can introduce more tones that blend with each other to produces tritones and quadtones. A Quadtone Portrait This portrait taken in the Peruvian highlands is a quadtone, as you can see from the dialog box (SC-165). Note the horizontal gradient at the bottom of the box. This is a preview that shows how all four colors will blend together in the final image. Hue and Saturation For an Old West feel, I transformed a color portrait of a cowboy into a quadtone, and then using Image > Mode > RGB color I brought the image back into the RGB color space. I then went to Image > Adjustments > Hue/Saturation and changed the hue as well as the saturation of the image for a completely different look. Controlling the Tonality In this duotone, I used a different shade of blue (SC-164), and the mixture with the underlying black-and-white image transformed a color portrait I made in India into a compelling image. The boxes on the left with the diagonal line running through them can be clicked to open a new dialog box. It is here that you control how much tonality is placed in the shadow and highlight areas. As the lower portion of the line is raised, highlights become more bluish; as the top right end of the line is dragged down, the shadows have less blue.