How to extract clouds and flames

If you have always wondered how to extract clouds and flames from their backgrounds, the following exercise is for you. Download the image of a flame and open t in Photoshop.

Go to the channels window (Window>Channels). Here ctrl+click con the red channel. You should see a selection active on your image.
Why red channel? Choose the channel in according with the image. Channels having more contrasts will allow you to detect less pixels. Channels with less contrast will detect more pixels.
 Now you can copy (ctrl+C) and paste (ctrl+V) your flames into another image, as I did in this tutorial written for DesignInstruct

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