DaVinci Resolve terms

Alpha Output

An output channel for the alpha transparency information in a clip or composite.

What is an Alpha Output in DaVinci Resolve?

An Alpha Output in DaVinci Resolve refers to a type of video output that includes an alpha channel. The alpha channel is a color component that represents the degree of transparency (or opacity) of a color. It's used to control the visibility and transparency of objects in a scene.

In DaVinci Resolve, an Alpha Output is often used in compositing and visual effects work. For example, if you're working with green screen footage, you can use the Alpha Output to isolate the subject from the green screen and overlay it onto a different background. This output can be viewed in the Alpha Overlay mode in the viewer. It's important to note that not all codecs support alpha channels, so you'll need to ensure you're using a compatible codec when exporting your project.

How to adjust Alpha Output in DaVinci Resolve?

To adjust the Alpha Output in DaVinci Resolve, you first need to open the software and import your video file. Once your video is imported, navigate to the 'Color' tab located at the bottom of the screen. This will open the color grading workspace.

In the color grading workspace, you will find the 'Nodes' panel. Right-click on the node where you want to adjust the Alpha Output and select 'Add Alpha Output'. A small blue dot will appear on the node. Drag a line from this blue dot to the blue dot on the right side of the Nodes panel. This connects the alpha channel. Now, you can adjust the Alpha Output by using the 'Qualifier' tool in the 'HSL' tab. Adjust the parameters until you achieve the desired effect. Remember to always preview your changes to ensure they meet your expectations.

Why is my Alpha Output not working in DaVinci Resolve?

There could be several reasons why your Alpha Output is not working in DaVinci Resolve. One common issue could be related to the settings of your project. Ensure that your project settings are correctly configured to support Alpha Output. This includes checking the color space, bit depth, and resolution. Also, make sure that the media you are working with supports Alpha channels.

Another possible reason could be related to the node structure in the color page. If the nodes are not correctly connected, it might cause issues with the Alpha Output. Make sure that the Alpha Output is connected to the correct node. If you are using Fusion, ensure that the media out node is correctly set up. If these solutions do not work, it might be a software bug. In this case, consider updating DaVinci Resolve to the latest version or reaching out to Blackmagic Design's support for further assistance.

Can I change the Alpha Output settings in DaVinci Resolve?

Yes, you can change the Alpha Output settings in DaVinci Resolve. This feature is particularly useful when you are working with graphics or visual effects that require transparency. The Alpha Output settings can be found in the Deliver page of DaVinci Resolve.

To change the settings, you need to go to the Deliver page, then in the Video section, you will find the 'Export Alpha' option. If you want to export the alpha channel, you need to check this box. Please note that this option is only available when you choose a codec that supports alpha channels, such as DNxHR 444, ProRes 4444, or Cineform RGB 12-bit.

If you use DaVinci Resolve...

You should try Tella.tv - a screen recorder that doesn't compromise on speed or creativity.

Tella simplifies video creation: record, customize, and share in one place; combine separate clips and quickly remove mistakes; apply beautiful backgrounds, layouts, and effects with just a few clicks; share the video link or export in 4K.

With Tella, create product demos, tutorial videos, and online courses that look amazing in minutes, not hours!

Tella screen recorder

< Back to DaVinci Resolve glossary

Try Tella today!

Screen recording for creators — simple and powerful.

7-day free trial — no credit card required