Step 1 – Make sure your After Effects Composition has a transparent backgroundĪt the bottom of your composition panel on the left of active camera there is a little icon checker box icon (Toggle Transparency Grid), click on and off to switch between the checker background or the black background. How to render an After Effects composition with an alpha channel and transparent background?Įxporting ,rendering a video with an alpha channel is actually very straight forward just follow these simple steps below. The alpha channel is used primarily in alpha blending and alpha compositing. If the value is in between, the resulting color has a varying degree of transparency/opacity, which creates a translucent effect. If the alpha value is opaque, the source color overwrites the destination color if transparent, the source color is invisible, allowing the background color to show through. When a color (source) is blended with another color (background), e.g., when an image is overlaid onto another image, the alpha value of the source color is used to determine the resulting color. Its value can be represented as a real value, a percentage, or an integer: full transparency is 0.0, 0% or 0, whereas full opacity is 1.0, 100% or 255, respectively. The alpha channel controls the transparency or opacity of a color. It is used to determine how a pixel is rendered when blended with another. The alpha channel is a color component that represents the degree of transparency (or opacity) of a color (i.e., the red, green and blue channels). If you are interested in a detailed definition of a what is an alpha channel I got one from below: My simple definition of alpha channel, a colored image has 3 standard channels red,green,blue, the 4th channel is the alpha which allows you to control the opacity or transparency.
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