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https://support.apple.com/en-us/HT202410
Apr 09, 2018 · * Apple ProRes 4444 and Apple ProRes 4444 XQ are ideal for the exchange of motion graphics media because they are virtually lossless. They are also the only Apple ProRes codecs that support alpha channels.
https://discussions.apple.com/thread/2260795
Dec 10, 2009 · Pro res 422 doesn't support an alpha channel. You need to export the video using the Animation+million codec. FCP 7 Pro res 4444 codec supports an Alpha channel If you exporting to AE why not import the video directly into AE and use the Keylight plugin to do the keying.
https://en.wikipedia.org/wiki/Apple_ProRes
Alpha channel support at up to 16-bit sample depth; ProRes RAW. In April 2018 Apple released ProRes RAW. It is built upon the same technology as other ProRes codecs, but is directly applied to the raw data coming from the sensor, thus delaying the debayering process to the post-production stage. ProRes RAW therefore aims at quality and better colour reproduction, rather than performance.
https://www.rocketstock.com/blog/video-codecs-and-image-sequences-with-alpha-channels/
Jan 06, 2017 · I’d highly suggest using GoPro Cineform RGB 12-bit with alpha at Maximum Bit Depth. Another great option is the always useful ProRes codec — be sure to select Apple ProRes 4444 for the alpha channel. Another Apple option is the Animation codec. These are just a few suggestions; scroll to the bottom for a more extensive codec list.
https://larryjordan.com/blog/what-is-prores-4444-xq/
Jun 27, 2014 · Apple ProRes 4444 XQ and Apple ProRes 4444 support image sources up to 12 bits and preserve alpha sample depths up to 16 bits. All Apple ProRes 422 codecs support up to 10-bit image sources, though the best 10-bit quality is obtained with the higher‑bit-rate family members—Apple ProRes 422 and Apple ProRes 422 HQ.
https://support.apple.com/guide/motion/supported-media-formats-motn1252ada3/mac
Excessively compressed clips can display undesirable visual artifacts. Fortunately, many formats are ideal for moving uncompressed or minimally compressed video files between applications, including Apple ProRes, Uncompressed 8- and 10-bit 4:2:2, DVCPRO50, and so on. Some codecs support alpha channels, which define areas of transparency in the clip.
https://www.apple.com/lae/final-cut-pro/docs/Apple_ProRes_White_Paper_December_2013.pdf
“4” means that Apple ProRes 4444 can also carry a unique alpha-channel sample for every pixel location. Apple ProRes 4444 is intended to support 4:4:4:4 RGB+Alpha sources exported from computer graphics applications such as Motion, as well as 4:4:4 video sources from high-end devices such as dual-link HDCAM-SR.
https://www.cinema5d.com/adobe-adds-prores-export-on-windows-for-premiere-after-effects/
Dec 12, 2018 · Adobe worked with Apple to provide ProRes export using Premiere Pro and After Effects. Support for ProRes on Mac OS and Windows helps streamline video production and simplifies final output, including server-based remote rendering with Adobe Media Encoder.
https://www.apple.com/final-cut-pro/docs/Apple_ProRes_White_Paper.pdf
Like standard Apple ProRes 4444, this codec supports up to 12 bits per image channel and up to 16 bits for the alpha channel. Apple ProRes 4444 XQ features a target data rate of approximately 500 Mbps for 4:4:4 sources at 1920 x 1080 and 29.97 fps. Note: Apple ProRes 4444 XQ requires OS X 10.8 Mountain Lion or later.
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