This will set the gamma, even if not in full-screen. This is the best way to do overbrightening of lightmaps, and ensure that the graphic will look the same on all cards.
win=CreateWindow("",0,0,400,300) hwnd=QueryObject(win,1) hdc=GetDC(hwnd) ;Don't fuck with this! ;======================================= oldgammaramp=CreateBank(256*3*2) GetDeviceGammaRamp hdc,oldgammaramp ;======================================= gammaramp=CreateBank(256*3*2) GetDeviceGammaRamp hdc,gammaramp For n=0 To BankSize(gammaramp)/2-1 DebugLog PeekByte(gammaramp,n*2+0)+" - "+PeekByte(gammaramp,n*2+1) r=PeekByte(gammaramp,n*2+1)*2 If r>255 r=255 PokeByte gammaramp,n*2+1,r Next SetDeviceGammaRamp hdc,gammaramp FreeBank gammaramp Repeat Delay 1 Until KeyHit(1) SetDeviceGammaRamp hdc,oldgammaramp End