ColorEngineX is a very powerful multipurpose image editing application focusing particularly on providing advanced processing in the areas of color channel control, highlight control, shadowing, skin color retention while adjusting the color of other parts of an image.
Key features include:
Saturation of non-skin tones, to boost or reduce color in an image but leave face tones unchanged.
Very detailed control of color channels and color biases.
Built in and user-editable presets, ranging from standard features such as "1970s" look, to cartoon coloring.
Instant rendering of all image processing and saving of images at full resolution.
Many other color controls (e.g. gamma power, exposure, etc)