Linear compositing (also known as Linear light compositing or Scene-referred linear light compositing) is the process of combining images in linear space, which more accurately simulates how a camera (and an eye) captures light.
Linear compositing requires HDR video material, either from an HDR source or upsampled from an SDR source (like Rec.709).
Advantages
Traditional video mixing is done with images and videos that are encoded in video gamma space (Video space - legacy). This means that the pixel values in the images no longer have a 1:1 relationship with the light values they represent, and when we mix them we get unrealistic results.
Comparison of Pixotope's compositing modes
Out of focus
The bright sky on the left accurately bleeds over the darker areas (Left - Linear space | Right - Video space).
Exposing the background
The bright sky on the left accurately bleeds over the fine hair (Left - Linear space | Right - Video space).
Motion blur
The bright lights on the left create accurately exposed light streaks (Left - Linear space | Right - Video space).
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