This experiment also consisted of six target treatments arranged in
Targets were created in Adobe Photoshop CS4 using the Lasso Tool to select an area of the size and shape of the triangle targets. This selection was superimposed over a tree background and used for the control boundary treatment. To produce transparent edges, the selection's boundary is ‘feathered’ over 10 pixels (Select > Modify > Feather). Over this 10-pixel transect, opacity was incrementally decreased.