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Using Gamma Controls to fade

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I''m trying to make my screen fade out, to no avail. I know that there are a lot of optimizations I could use in the below code, but I wrote it without optimizations for clarity.
  
}
// in game loop

	for(int blu = 255; blu > 0; blu--)
	{
		 MyGammaRamp.red[blu] = blu*257 - phade*257;
		 MyGammaRamp.blue[blu] = blu*257 - phade*257;
		 MyGammaRamp.green[blu] = blu*257 - phade*257;
	}

phade++;
if(phade == 255)
	phade = 1;
lp3dd->SetGammaRamp(D3DSGR_CALIBRATE, &MyGammaRamp);
}

[source]

I want the screen to fade out, but instead I get the mescaline affect. What''s wrong?  
-Forcas
"Elvis is alive. He is Barney the purple dinosaur. He is the pied piper that leads our children into the wages of sin and eternal damnation."

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When I tried to implement a fade function using Gamma controls it looked terrible. I don''t know if I did something wrong, but I''d recommend against it using Gamma ramps. Of course, I''m not an expert so I could be wrong

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