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When using a new palette in DooM, tone values based on DooM's are still used to decide the result, even when the new source palette has its colors "backwards":

Spoiler:

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Heretic's PlayPal, ColorMap, Player sprites, and color range (225-240)... in DooM.

(GZDoom screenshot, but this happens in ZDoom also. My player color is out of palette and looks bad in software, though.)

Tried switching the values in Player.ColorRange around, so the higher number was first - It understood the range just fine, but still rendered it backwards.

It would be more helpful if the specified color range were colorized from the loaded palette. (Bonus: A ColorRange could span two ramps and wouldn't try to make a continuous single color range.)

The attached file is simply a brightness-inverted version of the Doom palette. Load it and check your player sprite via chasecam - Your colors will appear as if the original palette is in use.

Looking back at this, I did a bit of reformatting and added an example mod.

(Also I hadn't realized this topic was so old now. )

This might be related to spaldoom.lmp and spalhtic.lmp in zdoom.pk3.

I don't remember if those are even used any more. And aren't they for skin use?

I've noticed this issue with all my custom palettes. They use left-to-right lightness ramps (opposite of DooM's) and they colorize horribly. (Unless I load over Heretic or Hexen, but that still uses their original tone ranges and looks terrible.) The actual range used doesn't matter, it still comes out like DooM's 112~127 would.