1. A machine readable medium storing a media editing application for editing images, the application comprising a graphical user interface (GUI), the GUI comprising: an image display area for displaying an image comprising a set of pixels, each pixel having a set of pixel values in a color space; a first GUI item for activating a first sampling tool for selecting a first section of the image displayed in the image display area, the first section comprising a first set of pixels, the first set of pixels for defining a first portion of the color space that encloses the pixel values of the first set of pixels, wherein a pixel in the image whose pixel values are in the first portion of the color space is fully selected; and a second GUI item for activating a second sampling tool for selecting a second section of the image displayed in the image display area, the second section comprising a second set of pixels, the second set of pixels for defining a second portion of the color space that encloses the first portion and excludes the pixel values of the first set of pixels, wherein a pixel in the image whose pixel values are in the second portion of the color space is partially selected.