diff --git a/python/envi.py b/python/envi.py
index 045433e..6a59975 100644
--- a/python/envi.py
+++ b/python/envi.py
@@ -16,6 +16,7 @@ import progressbar
 class envi_header:
     def __init__(self, filename = ""):
         if filename != "":
+            self.initialize()
             self.load(filename)
         else:
             self.initialize()
@@ -193,7 +194,7 @@ class envi_header:
         f.write("bands = " + str(self.bands) + "\n")
         f.write("header offset = " + str(self.header_offset) + "\n")
         f.write("file type = ENVI Standard" + "\n")
-        f.write("data type = " + str(self.get_envi_type(self.type)) + "\n")
+        f.write("data type = " + str(self.get_envi_type(self.data_type)) + "\n")
         f.write("interleave = " + self.interleave + "\n")
         f.write("sensor type = " + self.sensor_type + "\n")
         f.write("byte order = " + str(self.byte_order) + "\n")
@@ -268,7 +269,8 @@ class envi:
         #open the file
         self.header = envi_header(headername)
         self.file = open(filename, "rb")
-        
+    
+    # load the entire ENVI file into memory and return it as an array
     def loadall(self):
         X = self.header.samples
         Y = self.header.lines
@@ -286,6 +288,15 @@ class envi:
         elif self.header.interleave == "bil":
             D = numpy.reshape(D, (Y, B, X))
             return numpy.rollaxis(D, 1)
+    
+    #save an updated version of the file (all header information is assumed to be the same)
+    def saveall(self, D, filename):
+        
+        new_header = self.header
+        new_header.interleave = "bsq"
+        new_header.save(filename + ".hdr")
+        D.tofile(filename)
+        
         
     #loads all of the pixels where mask != 0 and returns them as a matrix
     def loadmask(self, mask):
--
libgit2 0.21.4