Reports from the Field
Working beyond RGB

On one hand, as it is current practice since years in other fields of fine arts’ conservation and restoration, there is an increasing interest in working with multispectral content for moving images as well.

On the other hand, when working with old colour processes, like the additive ones used during the first half century of cinema, it’s often more effective to handle independently the luma Y′ component and the chroma C₁ and C₂ components. Working with C_O and C_G is easier than working with the common C_B and C_R, because the de-correlation of the colour planes is better and the transcoding from and to R′G′B′ is faster. Therefore one can check quicker the results on modern monitors.

Some good reasons to look at colours in film conservation and restoration from a wider point of view!

When and where

A short talk with demonstrations by Reto Kromer, followed by an informal Q&A session and light refreshments, on Friday the 14^th of June 2019, starting at 11 o’clock sharp, at AV Preservation by reto.ch in Écublens (a suburb of Lausanne, Switzerland).

As usual, the admission is free, but an inscription is required, because only six places are available at our small facility. Note that this will be a technical meeting and the attendees should be familiar with high-school maths, including functions, linear transformations and elementary matrix operations.

Note

• We are very unhappy that our generosity is often betrayed, as many of our materials are distributed without naming their origin. Increasingly, others are even shamelessly claiming authorship of our work, which is just disgusting behaviour. And that’s the very reason why some resources are no longer freely available, but have been moved to password-protected parts of our website.

2023-02-17