What does gamma set to 10 mean? - default gamma is usually 2.2

Premiere Pro default gamma is set to 10.  It can range from 1 to 28.  Is the default of 10 really a gamma factor of 2.2?  And how can we determine the actual gamma correction using Adobe's 1-28 scale?

Ah, I see.  I never knew it was there ;-(
However, if you study the waveform monitor when you apply it, and before you've made an adjustment, you'll see that it takes the whites down to legal levels - under 100 IRE.  It probably does the same (in reverse) to crushed blacks.
Much better tools for luma correction are pedestal/ lift gamma/midtones and gain/highlights control in either RGB Correction or Luma Corrector.
The 2.2 gamma you talk about is monitor "brightness", to simplify, and affects how an image appears on your local monitor(s).  Gamma in video correction affects the luma component of the source material itself, no matter what your monitor gamma is set to.

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