1. A method of masking a portion of an object using a presentation application implemented on an electronic device, the method comprising: identifying an initial color of an initial point on the object received from a user; computing a color tolerance for the initial color that is derived from a distance between the initial point and a second location on the object defined by the user; selecting for masking the portion of the object that includes the initial point based on the initial color and the color tolerance; generating a new mask based on the selected portion of the object; generating a masked object by applying a plurality of masks, including the new mask, to the object while leaving the object unchanged; storing the masked object by storing the unchanged object and a plurality of masks; and presenting the masked object on a display of the electronic device.