eHow - Computershttp://www.ehow.com/guide_5-http://www.ehow.com/guide_5-computers.html.htmlwww.ehow.comMixing Layers With Opacity Settings in Photoshophttp://www.ehow.com/how_4445126_mixing-layers-opacity-settings-photoshop.htmlChanging the opacity setting on upper layers in Photoshop allows one to effectively mix or blend layers together. Learn to mix layers in Photoshop CS3 in this free Photoshop tutorial video. Published on 7/17/2008