Screen Mode
If Multiply mode acts like ink, then Screen mode is its opposite, acting like light instead. In this mode, black simply disappears, while anything brighter than black will brighten the underlying image. Screen mode is useful when you have an image with a black background, with anything that resembles light. I like to use it with things like sparklers and lightning. I just put the sparkler on a layer above another image, set the layer mode to Screen, and then choose Image > Adjust > Levels and pull the upper-left slider in until the background of the sparkler disappears (Figures 13.56 and 13.57).
Figure 13.56. Result of using Screen mode to combine images. (©Stockbyte, www.stockbyte.com)
Figure 13.57. Result of applying Levels ...
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