If you'd like to mix Colorama's changes with the original colors in the image, you can do so in a couple of ways.
For instance, you can click on any of the color stops and observe the lines that connect the stop to a checkerboard below the wheel. If you drag the color stop above the checkerboard to the left, that color will get more and more transparent as you drag, allowing the original color to show through.
You can also scrub the Blend with Original slider, near the bottom of the parameter list, to fade the original image back in.