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# Batch Concepts: Clips

Clips are a sequence of images or frames loaded from an external device such as a VTR and stored in digital format. They are loaded into Batch from the clip library, the EditDesk, the Import Image module, or a Gateway Library. Clips form the root element of a process tree.

Batch clips can contain video tracks or stereo tracks. Gateway Library clips can contain multiple channels. Each type supports dual output. Clips with video tracks can have RGB and matte outputs. Clips with stereo tracks have left eye and right eye outputs and left and right matte outputs corresponding to the left eye and right eye layers of its stereo track. Clips with channels can have RGB and alpha outputs.

(a) RGB output(b) Matte output(c) Left eye (layer) output(d) Right eye (layer) output

Gateway imported clip can be expanded to display the channels that make it up. Press Ctrl+C to toggle between collapsed and expanded.

(a) Collapsed Gateway imported clip output(b) Expanded clip (c) RGB output (channel) output(d) Alpha output (channel) output

A stereo clip can be expanded to display all of its matte outputs. See Grouping Nodes.