- pixel=(MagickRealType) ((source->matte != MagickFalse ?
- GetPixelAlpha(source,p) : OpaqueAlpha)-(source->matte != MagickFalse ?
- GetPixelAlpha(destination,q) : OpaqueAlpha));
+ pixel=GetPixelAlpha(source,p)-(MagickRealType)
+ GetPixelAlpha(destination,q);