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Turn alpha blending operations off
void PgAlphaOff( void ); void PgAlphaOffCx(PhGC_t *gc);
These functions turn alpha blending operations off. PgAlphaOff() works on the current graphics context, while you can specify the graphics context for PgAlphaOffCx().
"Alpha Blending Support" in the Raw Drawing and Animation chapter of the Photon Programmer's Guide