ADV7183B Gain operation

Please confirm or comment on these ADV7183B questions:

  1. the manual luma gain scales the whole signal from sync tip to peak white?
  2. the brightness only adds a DC offset on top of black?
  3. the contrast only scales the video above black?
  4. If I have my RANGE set to 16-235, and have a gain/brightness/contrast combo that is too high, it will clip the whites and saturate at 235, but everything else is normal and linear from black to the clipping point