From the "How do I" thread:
Blue Shadow wrote:It can be changed "globally" by using [wiki=GameInfo_definition]pickupcolor[/wiki] mapinfo property.Vaecrius wrote:For pain there's player.damagescreencolor but I haven't the slightest clue about changing pickup flash.Flynn Taggart wrote:How do I change the color of the flash when you pick up items and the flash when you get hurt. For example, Item pickups will make your hud flash blue instead of yellow or being shot makes your hud flash pink.
amv2k9 wrote:What if you want no flash at all? I 've been making pickup flashes with A_SetFade and I'd rather not have the two overlapping.
Blue Shadow wrote:I could be wrong, but I don't think there is a way to disable the [wiki=Palette_flash]palette flash[/wiki] for item pickup, currently.