diff --git a/python/tests/test_Colormap.py b/python/tests/test_Colormap.py
index daeeaf775..d3cbcaacd 100644
--- a/python/tests/test_Colormap.py
+++ b/python/tests/test_Colormap.py
@@ -21,10 +21,14 @@ class TestColormap:
             print('rgb',rgb)
 
             # rgb2hsv2rgb
-            assert np.allclose(Colormap._hsv2rgb(Colormap._rgb2hsv(rgb)),rgb)
+            hsv = Colormap._rgb2hsv(rgb)
+            print('hsv',hsv)
+            assert np.allclose(Colormap._hsv2rgb(hsv),rgb)
 
             # rgb2hsl2rgb
-            assert np.allclose(Colormap._hsl2rgb(Colormap._rgb2hsl(rgb)),rgb)
+            hsl = Colormap._rgb2hsl(rgb)
+            print('hsl',hsl)
+            assert np.allclose(Colormap._hsl2rgb(hsl),rgb)
 
             # rgb2xyz2rgb
             xyz = Colormap._rgb2xyz(rgb)
@@ -37,4 +41,21 @@ class TestColormap:
             assert np.allclose(Colormap._lab2xyz(lab),xyz)
 
             # lab2msh2lab
-            assert np.allclose(Colormap._msh2lab(Colormap._lab2msh(lab)),lab)
+            msh = Colormap._lab2msh(lab)
+            print('msh',msh)
+            assert np.allclose(Colormap._msh2lab(msh),lab)
+
+            # lab2rgb2lab
+            assert np.allclose(Colormap._rgb2lab(Colormap._lab2rgb(lab)),lab,atol=1.e-6,rtol=0)
+
+            # rgb2msh2rgb
+            assert np.allclose(Colormap._msh2rgb(Colormap._rgb2msh(rgb)),rgb,atol=1.e-6,rtol=0)
+
+            # hsv2msh
+            assert np.allclose(Colormap._hsv2msh(hsv),msh,atol=1.e-6,rtol=0)
+
+            # hsl2msh
+            assert np.allclose(Colormap._hsv2msh(hsv),msh,atol=1.e-6,rtol=0)
+
+            # xyz2msh
+            assert np.allclose(Colormap._xyz2msh(xyz),msh,atol=1.e-6,rtol=0)