code: public static void multiply( GrayU8 input , double value , GrayU8 output ) {
  
  		output.reshape(input.width,input.height);
  
  		int columns = input.width;
  		if(BoofConcurrency.USE_CONCURRENT ) {
  			ImplPixelMath_MT.multiplyU_A(input.data,input.startIndex,input.stride,value , 
  					output.data,output.startIndex,output.stride,
  					input.height,columns);
  		} else {
  			ImplPixelMath.multiplyU_A(input.data,input.startIndex,input.stride,value , 
  					output.data,output.startIndex,output.stride,
  					input.height,columns);
  		}
  	}
docs: Multiply each element by a scalar value. Both input and output images can
  be the same instance.
  
  @param input The input image. Not modified.
  @param value What each element is multiplied by.
  @param output The output image. Modified.