ColorBlast! HD (iPad) app for $0.99
ColorBlast! let’s you create dynamic black and white photos with selected areas of color by simply brushing in the area of interest.
ColorBlast! offers unique selective color brushes that help you to highlight an individual color without the frustrating zooming and erasing along the edges that other apps require. It also let’s you change the color of an object or tint the background to a sepia or other tone.