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Video terminology

Before using After Effects, you should familiarize yourself with the following terms:

Alpha channel Color digital images often consist of three channels, one composed of red information, one of green information, and one of blue information (called RGB for short). In addition, a computer image or footage may have a fourth, invisible channel that defines transparent areas for the footage item or layer that contains the channel. With imported items, an alpha channel provides a way to store both the footage and its transparency information in a single file without disturbing the footage item's other color channels. Each After Effects layer contains one alpha channel, which can accommodate an alpha channel included with a footage item.


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