diff --git a/src/rok4/Layer.py b/src/rok4/Layer.py
index 74387ae..b13e55a 100644
--- a/src/rok4/Layer.py
+++ b/src/rok4/Layer.py
@@ -12,10 +12,11 @@
 from typing import Dict, List, Tuple, Union
 
 from rok4.Exceptions import *
-from rok4.Pyramid import Pyramid, PyramidType
-from rok4.Storage import *
+from rok4.Pyramid import Pyramid
 from rok4.TileMatrixSet import TileMatrixSet
+from rok4.Storage import *
 from rok4.Utils import *
+from rok4.enums import PyramidType
 
 
 class Layer:
diff --git a/src/rok4/Pyramid.py b/src/rok4/Pyramid.py
index a06c73b..f6c670f 100644
--- a/src/rok4/Pyramid.py
+++ b/src/rok4/Pyramid.py
@@ -22,20 +22,7 @@
 from rok4.Storage import *
 from rok4.TileMatrixSet import TileMatrix, TileMatrixSet
 from rok4.Utils import *
-
-
-class PyramidType(Enum):
-    """Pyramid's data type"""
-
-    RASTER = "RASTER"
-    VECTOR = "VECTOR"
-
-
-class SlabType(Enum):
-    """Slab's type"""
-
-    DATA = "DATA"  # Slab of data, raster or vector
-    MASK = "MASK"  # Slab of mask, only for raster pyramid, image with one band : 0 is nodata, other values are data
+from rok4.enums import PyramidType, SlabType, StorageType
 
 
 ROK4_IMAGE_HEADER_SIZE = 2048
diff --git a/src/rok4/Storage.py b/src/rok4/Storage.py
index 20dc874..efc3696 100644
--- a/src/rok4/Storage.py
+++ b/src/rok4/Storage.py
@@ -46,17 +46,10 @@
 
 gdal.UseExceptions()
 
+from rok4.enums import StorageType
 from rok4.Exceptions import *
 
 
-class StorageType(Enum):
-    FILE = "file://"
-    S3 = "s3://"
-    CEPH = "ceph://"
-    HTTP = "http://"
-    HTTPS = "https://"
-
-
 __S3_CLIENTS = {}
 __S3_DEFAULT_CLIENT = None
 
diff --git a/src/rok4/Utils.py b/src/rok4/Utils.py
index 125e391..53450d7 100644
--- a/src/rok4/Utils.py
+++ b/src/rok4/Utils.py
@@ -3,6 +3,7 @@
 
 import os
 import re
+
 from enum import Enum
 from typing import Dict, List, Tuple, Union
 
@@ -13,18 +14,6 @@
 gdal.UseExceptions()
 
 
-class ColorFormat(Enum):
-    """A color format enumeration.
-    Except from "BIT", the member's name matches
-      a common variable format name. The member's value is
-      the allocated bit size associated to this format.
-    """
-
-    BIT = 1
-    UINT8 = 8
-    FLOAT32 = 32
-
-
 __SR_BOOK = {}
 
 
diff --git a/src/rok4/enums.py b/src/rok4/enums.py
new file mode 100644
index 0000000..76300ce
--- /dev/null
+++ b/src/rok4/enums.py
@@ -0,0 +1,28 @@
+#! python3  # noqa: E265
+
+# standard lib
+from enum import Enum
+
+
+class PyramidType(Enum):
+    """Pyramid's data type"""
+
+    RASTER = "RASTER"
+    VECTOR = "VECTOR"
+
+
+class SlabType(Enum):
+    """Slab's type"""
+
+    DATA = "DATA"  # Slab of data, raster or vector
+    MASK = "MASK"  # Slab of mask, only for raster pyramid, image with one band : 0 is nodata, other values are data
+
+
+class StorageType(Enum):
+    """Matrice de correspondance entre type de stockage et protocole."""
+
+    CEPH = "ceph://"
+    FILE = "file://"
+    HTTP = "http://"
+    HTTPS = "https://"
+    S3 = "s3://"
diff --git a/tests/test_Layer.py b/tests/test_Layer.py
index a35f649..bbf71eb 100644
--- a/tests/test_Layer.py
+++ b/tests/test_Layer.py
@@ -6,7 +6,7 @@
 
 from rok4.Exceptions import *
 from rok4.Layer import Layer
-from rok4.Pyramid import PyramidType
+from rok4.enums import PyramidType
 
 
 @mock.patch.dict(os.environ, {}, clear=True)
diff --git a/tests/test_Pyramid.py b/tests/test_Pyramid.py
index f5f1d60..3b75be5 100644
--- a/tests/test_Pyramid.py
+++ b/tests/test_Pyramid.py
@@ -6,8 +6,9 @@
 
 from rok4.Exceptions import *
 from rok4.Pyramid import *
-from rok4.Storage import StorageType
 from rok4.TileMatrixSet import TileMatrixSet
+from rok4.enums import SlabType, StorageType
+
 from rok4.Utils import *
 
 
diff --git a/tests/test_Storage.py b/tests/test_Storage.py
index f7b665d..8426ccf 100644
--- a/tests/test_Storage.py
+++ b/tests/test_Storage.py
@@ -8,6 +8,7 @@
 
 from rok4.Exceptions import *
 from rok4.Storage import *
+from rok4.enums import StorageType
 
 
 @mock.patch.dict(os.environ, {}, clear=True)