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Gamma Fading

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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;

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


I want the screen to fade out, but instead I get the mescaline affect. What''s wrong?    
"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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