Notes

Matroska (slide 8)

Matroska is actually a fork of a container that has never been completed, called Multimedia Container Format (MCF). And WebM, now developed by Google, is a fork of Matroska.

Y′C_BC_R 4:2:2 (slide 12)

Y′C_BC_R 4:2:2 content, as used by the video and broadcast community, can be lossless compressed, needing between one third and two third of the storage, when using the FFV1 video codec.

What is inside my DPX? (slide 14)

A .dpx file may contain different encodings of RGB information:

• log neg encoding
  Examples: Cineon Printing Density (CPD/DPX), ARRI log C
• log RGB encoding or quasi-log encoding
  Examples: FilmStream (log₆₀), SI-log (Silicon Imaging, log₉₀), ARRI log F, Panalog, S-log (Sony), REDLOG
• gamma encoding or power function encoding
  Examples: sRGB, CineGamma, “film rec”, hyper-gamma
• scene-linear encoding
  ACES

Proof of Concept (slide 15)

I have chosen an animated advertising film for Caran d’Ache, a Swiss manufacturer of writing instrument: Es geht nicht ohne / Nul ne peut s’en passer [= everybody needs it] by Werner Dressler and Leo Wullimann, produced in 1948.

This film has been shot in Dufaycolor, the first additive colour system suitable for the negative-positive process. You can see the “pixels” ante literam: red on one axis and green and blue on the other. The axis are turned by 22°. This type of image structure is indeed difficult to compress.

A 3.3K digitisation has been made from the original 35 mm camera negative by my students in June last year. We always scan the full film, from edge to edge, from the first image of the head leader to the last image of the foot leader. For the proof on concept I used 16-bit DPX files in 2K resolution, exported through DaVinci Resolve.

2018-07-06