ProRes is a lossy video compression format that was developed by Apple and it is for use in post-production that support up to 4k (the horizontal resolution, up to 4000 pixels). ProRes was created for video editing and not for use of viewing videos after they had been edited and exported. The format retains a high quality without the need of expensive disk systems compared to uncompressed video that would need expensive disk systems.
The key features of ProRes 422 are:
- 4K, 2K, HD and SD Resolutions
- 4:2:2 Chroma Subsampling
- 10-bit sample depth
- I-frame only encoding
- Variable bit rate encoding
- Normal 147 Mbit/s, High Quality 220 Mbit/s and ProRes (LT) 100Mbit/s at 60i
- Fast encoding and decoding
Apple ProRes 4444
ProRes 4444 is very similar to ProRes 422. It was introduced with Final Cut Studio in 2009 and provides better quality than it's predecessors, especially in the colour area. The extra features are:
- 4:4:4 Chroma Subsampling
- Up to 12-bit pixel depth
- Variable bit rate encoding
- Alpha channel support
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