There are two different things going on. Calibration, then profiling.
When you calibrate any monitor with any device/software meant for such use, you are always doing two steps. The first is calibration, which is kind of another way of saying you're linearizing the hardware. Calibration does these steps:
- White point color.
- Black point color.
- Gamma.
- Brightness.
- Gain.
Like all EIZO monitors, your LG stores the calibration settings directly in the monitor. This is a much more accurate control for these settings than manipulating the LUT of the video card, which is how it has to be done with less expensive monitors.
The OS doesn't need to know where these settings are, so it's fine to store them in the monitor itself. What the OS absolutely needs to know for proper color handling, is what the monitor is actually emitting.
That's where step two comes in. Profiling. You've calibrated your monitor, and the profile is then a mathematical reading of how color displays on the monitor relative to that calibration. Profiling is the step where your hardware/software reads the series of color patches after the calibration step is completed. This is important. You've can't create a profile and then go back and change only the calibration. That makes the current profile meaningless.
So, what you're looking at is this.
Years ago (closer to decades, now), all monitors came with a floppy disk or CD that had one item on it: A default profile from the factory for the monitor. People routinely lost or threw these away. To eliminate this waste of time and materials, all monitors now come with the default profile burned on a chip as part of the monitor's hardware. Every OS knows exactly where to look for this and copies that profile to the computer. That's what LG HDR 5K is.
The 2019-12-18-25-79-6315 profile is the one LG's True Color Pro app created after calibrating the hardware. This profile tells the OS exactly what the gamut and color range of your monitor is, based on the calibration settings you used. You can choose the other canned profiles if you want, but they are all entirely meaningless. None of those have the correct color data that tells the OS what your monitor is doing. Only the one you just created is accurate.
The OS has to have some way of knowing what your monitor looks like so ColorSync can do its job correctly. That's the profile. If that were also stored in the monitor's hardware, then the OS wouldn't have a clue what your monitor was doing since it would have no color reference for it. And the supplied default profiles are never accurate.
