An 8-bit colour channel which is used to specify the transparency of each pixel in an image. An alpha channel works like a sophisticated stencil, and is the digital equivalent of a matte.
www.warehouseexpress.com/photo/camcorders/glossary.html
An alpha channel can help us in our coursework as it can make backgrounds to images which we dont want transparent which will make it easier to move selected parts of the image.
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