opto-electrical transfer function curves (OETF), designed for screens with 10.000 cd/m2 (Image 10, next page). As shown in the graph, there are currently different proposed OETF curves, led by different groups: Dolby, Tecnicolor, BBC, etc. 3.7.-Immersive sound Image 8
Image 9
done with a high compressed dynamic range can be seen) (Imagen 9). In recent years, screen brightness has continued to grow, but contrary to the impression given, this has not allowed an increase of highlight detail. Information was not included in the signal and, therefore, we have only had brighter whites.
High dynamic range is intended for screens to be able to reproduce the same dynamic range that we are able to perceive through our retina. In this way, details collected by sensors of high quality cameras will reach viewers. In order to carry out this process it is essential to replace the color space and gamma curves designed for LDR, by the space color BT.2020 and its relevant
When it comes to sound, changes are also substantial. Surround sound is defined in a new dimension and we now can also see loudspeakers that are placed above the viewer's head to reproduce different environments, making it more immersive. We see new speaker set ups, like those seen in the graph, which undoubtedly show the need to introduce new mixing techniques. Think about mixing 22.2 channels. At home we do not have 24 loudspeakers, so how would we hear it then? The answer to this question is "sound from an object oriented approach", through which properties are added to the objects included in the sound scene so that the viewer's processor is able to customize sound according to the available loudspeakers. Dialogues, background music, ambiences, etc. are still mixed by following the traditional track notion. (Image 11). TMBi - 177