text: //
  //  MetalImageLuminanceFilter.h
  //  MetalImage
  //
  //  Created by erickingxu on 25/7/2016.
  //  Copyright © 2016 erickingxu. All rights reserved.
  //
  
  #import "MetalImageFilter.h"
  
  @interface MetalImageLuminanceFilter : MetalImageFilter
  
  
  -(void)setLuminanceBuffer:(float)lum;
  @end
  