diff --git a/envi/bsq.h b/envi/bsq.h
index 10a8bf7..05018b3 100644
--- a/envi/bsq.h
+++ b/envi/bsq.h
@@ -85,8 +85,8 @@ public:
 			getSlice(p, 2, page);
 		}
 
-//		free(p1);
-//		free(p2);
+		free(p1);
+		free(p2);
 		return true;
 	}
 
@@ -212,6 +212,42 @@ public:
 		target.close();
 		return true;
 	}
+
+	// normalize the BSQ file
+	bool normalize(std::string outname, double band)
+	{
+		unsigned int B = header.bands;		//calculate the number of bands
+		unsigned int XY = header.samples * header.lines;	//calculate the number of pixels in a band
+		unsigned int S = XY * sizeof(T);		//calculate the number of bytes in a band
+
+		std::ofstream target(outname.c_str(), std::ios::binary);	//open the target binary file
+		std::string headername = outname + ".hdr";              //the header file name
+
+		T * b;					//pointers to the certain wavelength band
+		T * c;				//pointer to the current image
+
+		b = (T*)malloc( S );     //memory allocation
+		c = (T*)malloc( S ); 
+
+		getBand(b, band);             //get the certain band into memory
+
+		for(unsigned j = 0; j < B; j++)
+		{
+			band_index(c, j);                     //get the current band into memory
+			for(unsigned i = 0; i < XY; i++)
+			{
+				c[i] = c[i] / b[i];
+			}
+			target.write(reinterpret_cast<const char*>(c), S);   //write normalized data into destination
+		}
+
+		header.save(headername);         //save the new header file
+		
+		free(b);
+		free(c);
+		target.close();
+		return true;
+	}
 	
 
 	};
--
libgit2 0.21.4