Found it! There's a lookup table that remaps the palette to a darker version of each color.
(Doom called these COLORMAPs)
So when it's trying to draw a dialog over the screen, it looks up each pixel in the COLORMAP instead of just using a 1:1 mapping. Thus, the background darkens, even in a 256-color mode that can't do color blending.
@Diogenese_Shiplap Asking the hard hitting questions fedi needs answers to.
@dwarvenallfather Environmentalists that are against nuclear power are watermelons: green on the outside and red on the inside. Playing devil's advocate, do we really want the government managing nuclear energy? Maybe it's best at this stage of the game to not. Too many niggers and shitskins roaming around to fuck it up.
@AryanSwastika Literally did this once. Tried killing a useless gov project while I was in the service to save millions a year, but my commander forgot she was in charge of it and it all fell through. 1.5 years of effort all for nothing. Also women.
@the7erm As much as I want to believe this, I don't think Gates and Soros are so stupid as to give their patsies any sort of information that could actually be used against them.
On the Internet, nobody knows you're a dog.