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– “Video Codec:” drop down should be Animation – Next to Format click on the drop down and select Quicktime Located on the bottom left of you render queue window Shortcut: Control+Command+M (MAC) or Ctrl+M (PC) Make sure the composition is open or selected on the project windowĬlick on Composition > Add to Render Queue Step 2 – Add your composition to the Render Queue Window

If you see the checkers board background correctly it means that your composition has a transparent background and you can export your video with the alpha channel. 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: If you enjoyed this tutorial, it’s only the beginning of what you can do using Adobe After Effects’ drawing tools! Discover everything that you can do with brushes, stamps, and erasers.Īre you a current student? See how you can save up to 60%.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. Drag the playhead to the beginning and press the spacebar to watch your animation from beginning to end. The tabs usually appear along the top of your project window. Close the paint layer by going back to your original composition. Click back into the main composition to view your animation.You can delete a brush using your computer’s delete key or modify the length of a brush by dragging the beginning and endpoints back and forth in the timeline. Scroll until you find the brush you would like to delete or modify. You should be able to see all of the brushstrokes you have created, each spanning the number of frames it occupies onscreen. To delete a brushstroke or change its duration, click the down arrow beside “effects” in your timeline window. You can move backwards in the timeline by pressing command+left arrow. Draw, advance.) until your animation reaches its final frame. Add your third one on top of this and repeat the step (Draw your frame, advance one frame forward. When you press command+right arrow this time, you should see only your second brushstroke. Repeat this step until your animation is complete.You’ll want to use the same color, but for the sake of this tutorial, I used white to show my first stroke and black to show the second. Nothing will change, but draw your second frame on top of the first one. Use the command key and right arrow key to advance to the next frame.The first frame might be boring, but the animation will look clean if it starts out small! For this example, I am going to draw a curly, moving doodle. 2 is a convenient duration because it allows your frames to overlap for a second-you will see how this works after the next couple steps. The duration indicates how many frames of motion your paint strokes will be on-screen for. Set the frame duration as a “custom” of 2f.In this example, I am using a simple, circular 15 px brush in the color white. Once this is created, you can select your paintbrush as well.