Why are there no video formats that support transparency?
Why are there no [widely supported] video formats that support transparency?
For example, the PNG image format supports transparency, allowing for some interesting effects in websites and documents. What's stopping us from having a video format that supports transparency in the same way?
But apparently video formats do support transparency.
http://www.digitalrebellion.com/blog/posts/list_of_video_formats_supporting_alpha_channels.html
Maybe too heavy for the web?
| File Format | Maximum Alpha Bit-Depth |
|---|---|
| Apple Animation | 8-bit |
| Apple ProRes 4444 | 16-bit |
| Avid Meridien Compressed | 8-bit |
| Avid Meridien Uncompressed | 8-bit |
| Cineon | 16-bit |
| DPX | 16-bit |
| Maya IFF | 32-bit |
| OpenEXR | 32-bit |
| PNG | 16-bit |
| RLA | 32-bit |
| RPF | 32-bit |
| SGI | 16-bit |
| SGI RAW | 16-bit |
| Targa (TGA) | 8-bit |
| TIFF | 32-bit |