Brightness changes are dependent on your Monitor and Graphics card for PC so the Guide is likely PC user... If two people use the exact same settings and the exact same GPU then the brightness grade can be confirmed for that setting on PC...
This is the console, the brightness range is meant to be fixed, but I expect Your TV will not be set up exactly the same as mine as you may have a light sensitivity or you may see green 20% less than me. So you turned the TV up, dropping the range of colour and brightness...
Core rocks have 3 fixed systems on PS4...
Mess about on PS5 settings, and you can break the native colours scale of the PS4 code on the TV. Native PS4 does not have those settings...
Yes, there are 3 FIxed units that need to be combined to 100% confirm a core rock on PS4..
1 Yes PS4 does have a Brightness scale on the rocks yes it does take time to learn BUT we have more than the brightness to work with..
2 SHAPE of rock, in each ring type only a single shape of the core rock will be a core rock, Yes 1 3D model was animated per ring class so every time its a core, the rock is an exact copy.. Names are given to these fixed shape per each ring type... For the high paying rocky ring it sad, but its a potato...
3 On the use of a pulse wave scanner you will generate on the rock a grid when you hit the rock with multi pulses, a colour grid pattern will display. this on it own gives a 50% its a core...
4 does not work at long range, so is ignored most times..
When combined all 3 are combined its a 100% confirmed core... then when inches from the rock you will see number 4 fissures render on the rock...
You dont ever need a prospector to confirm this the fissures will in time as you get closer render on the rock...
If you get number 2 wrong, you will find your self at the planned dummy decoy rock. It passed 1 and 3 but is actually the wrong shape...
Once you learn the shape per ring of the core rocks, you'll not end up at the dummy rock so often...
Should watch video on console YouTube app as then it should be on the TV colours then..
Source: https://youtu.be/1Mf0Sc4yiHQ
0:30 Bright return
0:30- 0:39 Grid pattern... and might be right shape...
0:39-0:44 Multi colour return grid patterns show... now shape is pointy potato
1:20 confirmed fissures render on rock...