In Doom, when acquiring the radiation suit or berserk, or when taking damage or gathering items, the colors on the screen are changed by changing the palette. Unlike changing the colormap, these actions affect the entire display (including the status bar, sky, and menus). However, hitting the F11 key, which increments the gamma correction value, will reset to the default palette 0. This bug does not affect the color changes caused by the invulnerability power-up, as that uses the colormap to change the colors.