Additive color model combining red, green, blue — native output of digital sensors and displays. Critical for grading decisions and on-set monitoring accuracy.
Every digital sensor operates on the RGB principle — Red, Green, Blue as additive color mixing. This sounds technical, but it's immediately relevant on set. Your camera output, your monitor, your color correction in the DI — everything is built on this three-channel system. When you open a RAW file from a RED or ALEXA, you see three separate data layers: one for each channel. The eye sees color because these three components are overlaid on your monitor. No magenta in the world exists as its own wavelength — it's always Red + Blue, added.
Why should you care about this on set? Because the linearity of these three channels is crucial for your image quality. A poorly calibrated monitor might show you a perfect image while the green channel is already clipping. Professional monitoring systems work with LUT-based color spaces that remap RGB values — for example, DCI or Rec. 2020. If you're working on an 8-bit monitor in low ambient light, you'll quickly notice that posterization occurs in one channel sooner than in others. This is due to the bit depth per channel. 10-bit systems give you 1024 gradations per RGB component, 8-bit only 256 — often most visible in green.
In practice, you check RGB balance using waveform monitors or histograms, not just by eye. An RGB parade shows you each channel individually side-by-side — you immediately see if your set white balance is off or if the lighting is unevenly clipping in one channel. Many cameras allow you to send raw output directly to external recorders; there you often see raw video formats like ProRes RAW or ARRIRAW, which store 12 or 16 bits per RGB component. This gives you maximum flexibility in color correction.
A common mistake: confusing RGB values with gamma. Video RGB is usually linear or gamma-encoded, depending on the color space. When you're working with curves in Fusion or DaVinci and suddenly notice that green reacts much more aggressively than red, it's often due to different gamma values per channel. That's why clean LUT management is worthwhile — and consistent use of the same color range from sensor to edit.