diff --git a/nd2reader/exc.py b/nd2reader/exc.py
new file mode 100644
index 0000000..eda1f2d
--- /dev/null
+++ b/nd2reader/exc.py
@@ -0,0 +1,2 @@
+class InvalidVersionError(Exception):
+    pass
diff --git a/nd2reader/imreader/v3.py b/nd2reader/imreader/v3.py
index 28f448a..9285e1b 100644
--- a/nd2reader/imreader/v3.py
+++ b/nd2reader/imreader/v3.py
@@ -1,9 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import array
-from datetime import datetime
 import numpy as np
-import re
 import struct
 import six
 from nd2reader.model.image import Image
@@ -59,7 +57,7 @@ class V3ImageReader(object):
 
         """
         channel_offset = {}
-        for n, channel in enumerate(self._channels):
+        for n, channel in enumerate(self._metadata.channels):
             channel_offset[channel] = n
         return channel_offset
 
@@ -86,7 +84,7 @@ class V3ImageReader(object):
         # The images for the various channels are interleaved within the same array. For example, the second image
         # of a four image group will be composed of bytes 2, 6, 10, etc. If you understand why someone would design
         # a data structure that way, please send the author of this library a message.
-        image_data = np.reshape(image_group_data[image_data_start::len(self.channels)], (height, width))
+        image_data = np.reshape(image_group_data[image_data_start::len(self._metadata.channels)], (height, width))
         # Skip images that are all zeros! This is important, since NIS Elements creates blank "gap" images if you
         # don't have the same number of images each cycle. We discovered this because we only took GFP images every
         # other cycle to reduce phototoxicity, but NIS Elements still allocated memory as if we were going to take
diff --git a/nd2reader/model/image.py b/nd2reader/model/image.py
index 31ad0c6..5637870 100644
--- a/nd2reader/model/image.py
+++ b/nd2reader/model/image.py
@@ -21,10 +21,6 @@ class Image(np.ndarray):
         :type channel: str
         :param z_level: The label for the location in the Z-plane where this image was taken.
         :type z_level: int
-        :param height: The height of the image in pixels.
-        :type height: int
-        :param width: The width of the image in pixels.
-        :type width: int
 
         """
         self._timestamp = timestamp
@@ -37,12 +33,20 @@ class Image(np.ndarray):
         return "\n".join(["<ND2 Image>",
                           "%sx%s (HxW)" % (self.height, self.width),
                           "Timestamp: %s" % self.timestamp,
-                          "Frame: %s" % self._frame_number,
+                          "Frame: %s" % self.frame_number,
                           "Field of View: %s" % self.field_of_view,
                           "Channel: %s" % self.channel,
                           "Z-Level: %s" % self.z_level,
                           ])
 
+    @property
+    def height(self):
+        return self.shape[1]
+
+    @property
+    def width(self):
+        return self.shape[0]
+
     @property
     def field_of_view(self):
         """
diff --git a/nd2reader/parser/parser.py b/nd2reader/parser/parser.py
index cc09374..d3e7488 100644
--- a/nd2reader/parser/parser.py
+++ b/nd2reader/parser/parser.py
@@ -1,2 +1,10 @@
+from nd2reader.parser.v3 import V3Parser
+from nd2reader.exc import InvalidVersionError
+
+
 def get_parser(filename, major_version, minor_version):
-    parsers = {}
+    parsers = {(3, None): V3Parser}
+    parser = parsers.get((major_version, minor_version)) or parsers.get((major_version, None))
+    if not parser:
+        raise InvalidVersionError("No parser is available for that version.")
+    return parser(filename)
diff --git a/nd2reader/version.py b/nd2reader/version.py
index d4a02fc..9434d2f 100644
--- a/nd2reader/version.py
+++ b/nd2reader/version.py
@@ -1,8 +1,5 @@
 import re
-
-
-class InvalidVersionError(Exception):
-    pass
+from nd2reader.exc import InvalidVersionError
 
 
 def get_version(filename):