1. A method of providing an image-editing application having a user interface (UI), the method comprising: providing a display area for displaying an image defined by a plurality of pixels, each pixel having a set of component color values that corresponds to a color sample in a color space; and providing a single adjustable UI item that, in response to a single adjustment to the single adjustable UI item: (i) for each pixel having a set of component color values that falls within a sub-region of the color space, non-uniformly adjusts the pixel's set of component color values based on the single adjustment of the single adjustable UI item and a deviation of the pixel's set of component color values from a set of component color values of a particular color sample in the sub-region, and (ii) for each pixel having a set of component color values that falls outside of the sub-region of the color space, uniformly adjusts the pixel's set of component color values based on the single adjustment of the single adjustable UI item.