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DDRAW Transparency in 16 bit mode

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on 16 bit rgb mode how can i make bitmap transparent ?? suppose i want to disable the white colour then what should i use ?? here is my code but it isnt working lpBmp=Bitmapimage; DDCOLORKEY key; key.dwColorSpaceLowValue=0;//RGB16BIT(255,255,255); key.dwColorSpaceHighValue=255;//RGB16BIT(255,255,255); lpDDSPrimary->SetColorKey(DDCKEY_SRCBLT,&key); lpDDSPrimary->BltFast(x,y,lpBmp,0,FALSE);

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You need to set both the low and the high value to the color you want to be transparent. The code you have commented out on those lines should be put back in.

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