“…For example, firstly, it may be used to enhance depth perception in photographs (Marshall, Burbeck, Ariely, Rolland, & Martin, 1996;Pentland, 1987;Watt, Akeley, Ernst, & Banks, 2005). Secondly, it has been shown to contribute to the aesthetic appreciation of photographs (Datta, Joshi, Li, & Wang, 2006), and to make images appear more natural and realistic (Joshi et al, 2011). Thirdly, DOF is believed to be closely related to visual attention-the focal point of the image can be highlighted by blurring the remainder, thus drawing viewers' attention to specific positions in the photograph (Cole et al, 2006;Steve, Caitlin, & James, 2010).…”