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| Keying Green Backdrops |
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Seperate objects from green backdrops with presicion and control. Learn how to mask fine strands of hair and a translucent glass cup.
Identify the Green Backdrop
Before we add layer mask, we need to identify the green areas and create an black and white layer to represent the transparency of the image.
Step 1
Open a photo you would like to edit. Or, you may use the photo used in this tutorial (from iStockPhoto). Make sure that the image is in RGB color mode. To switch to RGB color mode, click on RGB Color under the Image> Mode menu.
Step 2
Add a Channel Mixer adjustment layer (Layer> New Adjustment Layer> Channel Mixer). In the Channel Mixer window, check the Monochrome checkbox and set the Red to 200% and the Green to -200%. Don't close the Channel Mixer window yet!
Step 3
Now drag the Constant slider towards the right until the object is a 100% white; not gray. Don't go overboard with the constant setting. If the constant is set too high, the images' edge detail will be loss.
Step 4
You'll notice that after apply the Channel Mixer adjustment layer, the green areas are not completely black. If we leave this alone, the greens will only be 50% transparent instead of 100% transparent. To fix this, select the Background layer and open the Hue/Saturation tool (Image> Adjustments> Hue/Saturation or Ctrl+U). In the Hue/Saturation tool, select Green from the Edit drop down menu and increase the saturation until the green areas turn black.
