Tintii is a Photoshop plugin and photography application for saturation control, especially selective colour effects.
Use Tintii to quickly create selective colour photos. Start with a full colour photo, then switch colours on (full colour) or off (black and white) to pop the subject.
Or… keep it subtle. Tintii can emphasise and exaggerate colours that form the key ingredients of a composition, to draw attention where it’s needed.