diff --git a/src/imagekit/models.py b/src/imagekit/models.py
index 48cb929..0350d9a 100644
--- a/src/imagekit/models.py
+++ b/src/imagekit/models.py
@@ -16,7 +16,7 @@ class IKModelBase(ModelBase):
         if not parents:
             return
     
-        user_opts = getattr(cls, 'IK', None)
+        user_opts = getattr(cls, 'IKConfig', None)
         opts = Options(user_opts)
         
         try:
@@ -24,11 +24,13 @@ class IKModelBase(ModelBase):
         except ImportError:
             raise ImportError('Unable to load imagekit config module: %s' % opts.config_module)
         
-        for spec in [spec for spec in module.__dict__.values() if \
-                     isinstance(spec, type) and issubclass(spec, specs.ImageSpec)]:
+        for spec in [spec for spec in module.__dict__.values() \
+                     if isinstance(spec, type) \
+                     and issubclass(spec, specs.ImageSpec) \
+                     and spec != specs.ImageSpec]:
             setattr(cls, spec.name(), specs.Descriptor(spec))
             opts.specs.append(spec)
-        
+            
         setattr(cls, '_ik', opts)
 
 
@@ -41,12 +43,10 @@ class IKModel(models.Model):
     """
     __metaclass__ = IKModelBase
 
-    image = models.ImageField(_('image'), upload_to='photos')
-
     class Meta:
         abstract = True
         
-    class IK:
+    class IKConfig:
         pass
         
     def admin_thumbnail_view(self):
@@ -59,21 +59,25 @@ class IKModel(models.Model):
                     (self.get_absolute_url(), prop.url)
             else:
                 return u'<a href="%s"><img src="%s"></a>' % \
-                    (self.image.url, prop.url)
+                    (self.ik_image_field.url, prop.url)
     admin_thumbnail_view.short_description = _('Thumbnail')
     admin_thumbnail_view.allow_tags = True
     
+    @property
+    def ik_image_field(self):
+        return getattr(self, self._ik.image_field)
+        
     @property        
     def cache_dir(self):
         """ Returns the path to the image cache directory """
-        return os.path.join(os.path.dirname(self.image.path),
-                            self._ik.cache_dir_name)
+        return os.path.join(os.path.dirname(self.ik_image_field.path),
+                            self._ik.cache_dir)
 
     @property
     def cache_url(self):
         """ Returns a url pointing to the image cache directory """
-        return '/'.join([os.path.dirname(self.image.url),
-                         self._ik.cache_dir_name])
+        return '/'.join([os.path.dirname(self.ik_image_field.url),
+                         self._ik.cache_dir])
     
     def _cleanup_cache_dirs(self):
         try:
@@ -94,12 +98,12 @@ class IKModel(models.Model):
                 prop.create()
 
     def save(self, *args, **kwargs):
-        if self._get_pk_val():
-            self._clear_cache()
+        #if self._get_pk_val():
+        #    self._clear_cache()
         super(IKModel, self).save(*args, **kwargs)
-        self._pre_cache()
+        #self._pre_cache()
 
     def delete(self):
         assert self._get_pk_val() is not None, "%s object can't be deleted because its %s attribute is set to None." % (self._meta.object_name, self._meta.pk.attname)
-        #self._clear_cache()
+        self._clear_cache()
         super(IKModel, self).delete()
diff --git a/src/imagekit/options.py b/src/imagekit/options.py
index ebde0f8..508c0aa 100644
--- a/src/imagekit/options.py
+++ b/src/imagekit/options.py
@@ -4,19 +4,14 @@ class Options(object):
     """ Class handling per-model imagekit options
 
     """
-    # Images will be resized to fit if they are larger than max_image_size
+    image_field = 'image'
     max_image_size = None
-    # Media subdirectories
-    image_dir_name = 'images'
-    cache_dir_name = 'cache'
-    # If given the image view count will be saved as this field name
+    cache_dir = 'ik_cache'
     save_count_as = None
-    # String pattern used to generate cache file names
     cache_filename_format = "%(filename)s_%(specname)s.%(extension)s"
-    # Configuration options coded in the models itself
     config_module = 'imagekit.config'
-    specs = []
     
     def __init__(self, opts):        
         for key, value in opts.__dict__.iteritems():
-            setattr(self, key, value)
\ No newline at end of file
+            setattr(self, key, value)
+            self.specs = []
\ No newline at end of file
diff --git a/src/imagekit/processors.py b/src/imagekit/processors.py
index 13a37be..8176b61 100644
--- a/src/imagekit/processors.py
+++ b/src/imagekit/processors.py
@@ -42,11 +42,11 @@ class Resize(ImageProcessor):
             box = (box_left, box_upper, box_right, box_lower)
             image = image.resize((int(resize_x), int(resize_y)), Image.ANTIALIAS).crop(box)
         else:
-            if not cls.width == 0 and not cls.height == 0:
+            if not cls.width is None and not cls.height is None:
                 ratio = min(float(cls.width)/cur_width,
                             float(cls.height)/cur_height)
             else:
-                if cls.width == 0:
+                if cls.width is None:
                     ratio = float(cls.height)/cur_height
                 else:
                     ratio = float(cls.width)/cur_width
diff --git a/src/imagekit/specs.py b/src/imagekit/specs.py
index 112eed0..8e8c997 100644
--- a/src/imagekit/specs.py
+++ b/src/imagekit/specs.py
@@ -52,16 +52,20 @@ class Accessor(object):
     def create(self):
         if not os.path.isdir(self._obj.cache_dir):
             os.makedirs(self._obj.cache_dir)
-        self._img = self.spec.process(Image.open(self._obj.image.path), save_as=self.path)
+        self._img = self.spec.process(Image.open(self._obj.ik_image_field.path), save_as=self.path)
         
     def delete(self):
         if self.exists:
             os.remove(self.path)
         self._img = None
         
+    @property
+    def exists(self):
+        return os.path.isfile(self.path)
+        
     @property
     def name(self):
-        filename, ext = os.path.splitext(os.path.basename(self._obj.image.path))
+        filename, ext =  os.path.splitext(os.path.basename(self._obj.ik_image_field.path))
         return self._obj._ik.cache_filename_format % \
             {'filename': filename,
              'specname': self.spec.name(),
@@ -75,17 +79,13 @@ class Accessor(object):
     def url(self):
         if not self.exists:
             self.create()
-        if self.spec.increment_count():
+        if self.spec.increment_count:
             fieldname = self._obj._ik.save_count_as
             if fieldname is not None:
                 current_count = getattr(self._obj, fieldname)
                 setattr(self._obj, fieldname, current_count + 1)
         return '/'.join([self._obj.cache_url, self.name])
         
-    @property
-    def exists(self):
-        return os.path.isfile(self.path)
-        
     @property
     def image(self):
         if self._img is None:
@@ -113,9 +113,6 @@ class Accessor(object):
 class Descriptor(object):
     def __init__(self, spec):
         self._spec = spec
-        self._prop = None
 
     def __get__(self, obj, type=None):
-        if self._prop is None:
-            self._prop = Accessor(obj, self._spec)
-        return self._prop
+        return Accessor(obj, self._spec)
diff --git a/src/imagekit/tests.py b/src/imagekit/tests.py
index a0801f9..94987a1 100644
--- a/src/imagekit/tests.py
+++ b/src/imagekit/tests.py
@@ -1,5 +1,5 @@
 import os
-import StringIO
+import tempfile
 import unittest
 from django.conf import settings
 from django.core.files.base import ContentFile
@@ -8,34 +8,71 @@ from django.test import TestCase
 
 from models import IKModel
 from specs import ImageSpec
+from imagekit import processors
 
 from imagekit import Image
 
+
+class ResizeToWidth(processors.Resize):
+    width = 100
+    
+class ResizeToHeigh(processors.Resize):
+    height = 100
+    
+class ResizeToFit(processors.Resize):
+    width = 100
+    height = 100
+    
+class ResizeCrop(ResizeToFit):
+    crop = True
+
+class TestResizeToWidth(ImageSpec):
+    access_as = 'to_width'
+    processors = [ResizeToWidth]
+
+
 IMG_PATH = os.path.join(os.path.dirname(__file__), 'test.jpg')
 
+
 class TestPhoto(IKModel):
     """ Minimal ImageModel class for testing """
-    name = models.CharField(max_length=30)
+    image = models.ImageField(upload_to='images')
+    
+    class IKConfig:
+        config_module = 'imagekit.tests'
+    
 
-
-class PLTest(TestCase):
+class IKTest(TestCase):
     """ Base TestCase class """
     def setUp(self):
-        Image.new('RGB', (100, 100)).save(IMG_PATH, 'JPEG')
-        self.p = TestPhoto(name='landscape')
-        self.p.image.save(os.path.basename(IMG_PATH),
-                           ContentFile(open(IMG_PATH, 'rb').read()))
+        # create a test image using tempfile and PIL
+        self.tmp = tempfile.TemporaryFile()
+        Image.new('RGB', (800, 600)).save(self.tmp, 'JPEG')
+        self.tmp.seek(0)
+        self.p = TestPhoto()
+        self.p.image.save(os.path.basename('test.jpg'),
+                           ContentFile(self.tmp.read()))
         self.p.save()
+        # destroy temp file
+        self.tmp.close()
+        
+    def test_config(self):
+        self.assertEqual(self.p._ik.specs, [TestResizeToWidth])
         
     def test_setup(self):
-        self.assert_(self.p.image is not None)
-        self.assertEqual(self.p.image.width, 100 )
+        self.assertEqual(self.p.image.width, 800)
+        self.assertEqual(self.p.image.height, 600)
         
-    def test_accessor(self):
-        self.assertEqual(self.p.admin_thumbnail.width, 100)
+    def test_to_width(self):
+        self.assertEqual(self.p.to_width.width, 100)
+        self.assertEqual(self.p.to_width.height, 75)
 
+    def test_url(self):
+        url = "%s/%s" % (self.p.cache_url, 'test_to_width.jpg')
+        self.assertEqual(self.p.to_width.url, url)
+ 
     def tearDown(self):
-        os.remove(IMG_PATH)
+        # make sure image file is deleted
         path = self.p.image.path
         self.p.delete()
         self.failIf(os.path.isfile(path))