… for Codecs & Media
Tip #701: How to Export an Alpha Channel
Alpha channels are not supported in H.264 or HEVC media.
The alpha channel determines transparency in a clip. However, no compressed codec supports alpha channels. Why? Because including the alpha channel makes a file really big!
Here, courtesy of RocketStock.com is a list of video codecs and image formats that support alpha channels.
Video Codecs and Image Formats with Alpha Channels
- Apple Animation
- Apple ProRes 4444
- Avid DNxHD
- Avid DNxHR
- Avid Meridien
- GoPro Cineform
- Maya IFF
- OpenEXR Sequence With Alpha
- PNG Sequence With Alpha
Be sure to test your codec before committing to a project. Not all versions of DNx or GoPro Cineform support alpha channels.