The first thing to realise from the previous pages is that to make on-set grading a viable operation the LUT used to view the images through has to be the same LUT as will be used in the DI on-line grading session - AND the monitor and viewing environment must be matched to the DI monitor and environment. If any of these are wrong the on-set grading will be next to useless.
The biggest problem here is making sure the on-set monitor and environment are set-up accurately...
It really is worthless attempting to rely on a laptop screen held on-set without any attempt to provide a dark viewing environment and calibrating the screen to accurate colourimetry settings.
So, for example, if the DI grading operation uses a monitor or projector calibrated to Rec709 specifications, with a D-65 colour temperature, and an illumination of 120cd/m2 (SMPTE specifications for tv monitoring) the on-set laptop would need to be calibrated to match to make the same Calibration LUT work on-set as in the DI operation.
Having said this, there is a possible different approach...
If it is impossible to calibrate the on-set monitor to match that of the DI set-up a different LUT can be used that takes into account the differences, and displays an image that looks the same as in the DI operation.
By now I'm really hoping this makes a lot of sense, and you can fully understand the reason this would work!
Next Page - LUT Building
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