The Tritone effect changes the color of a layer by mapping bright, dark, and midtone pixels to colors that you select. It is similar to the Tint effect, except with the addition of midtone control.
Apply the Tritone effect by selecting Effect, Color Correction, Tritone. The default gives your footage a kind of sepia look, as the midtones are mapped to brown. Highlights are mapped to white and shadows are mapped to black. You can basically use the midtone control to tint an image a color of your choice. Changing the highlights and shadows will affect your footage much more dramatically. For example, you could invert the image by setting the highlights to black and the shadows to white.
The blend with original property is the transparency of the effect. When it is set to a value of zero, the original image does not show through, but if we crank it up to 100%, the effects of Tritone disappear completely. Changing the blend amount can provide your footage with a slight tint without completely losing its original color information.