Apple ProRes Family

The Apple ProRes are a family of compressors-decompressor created by Apple. There are intended for Post-Prod. But the because of the high quality, they are know used during filming, archiving and broadcasting.

Caracteristics

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They share these caracteritics : 

  • Exists in Quicktime and MXF files
  • Compression is only spatial (easier to decode) and variable bitrate (VBR). 
  • Faster multiprocessor (de)compression 
  • definition decompression ½ and ¼  faster. 
  • Handle infra-black and super white
  • 5K, 4K, 2K, HD and SD with any frequency or interlacing known. 

Please note that ProRes 422 (HQ/standard/(LT) ?(proxy) have a 4:2:2 chromatic sub-sampling and a 10 bits depth (1 Billon colors).

On the opposit, ProRes 4444 standard/(XQ) doesnt have any chromatic sub-sampling. Color has the same definition than the luminance. The depth is 12 bits (64 billons of color shades), and they handle an “alpha layer” in 16 bits (transparency of 65536 shades) uncompressed. 

Compression Ratios

Le Prores 4444 XQ

becomes the standard codec for post prod files – digital intermediate. The volume is huge, but it is nothing compared to an uncompressed for almost the same quality.

Bitrates

Débits des Prores en fonction des résolutions SD et HD
SD to HD – Clic ➧ Big
Débits des Prores pour les résolutions de 2K à 8K
2K to 8K – Clic ➧ Big
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