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diff --git a/src/silx/gui/utils/test/test_image.py b/src/silx/gui/utils/test/test_image.py
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+++ b/src/silx/gui/utils/test/test_image.py
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+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2017-2018 European Synchrotron Radiation Facility
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# ###########################################################################*/
+"""Test of utils module."""
+
+__authors__ = ["T. Vincent"]
+__license__ = "MIT"
+__date__ = "16/01/2017"
+
+import numpy
+import unittest
+
+from silx.gui import qt
+from silx.utils.testutils import ParametricTestCase
+from silx.gui.utils.testutils import TestCaseQt
+from silx.gui.utils.image import convertArrayToQImage, convertQImageToArray
+
+
+class TestQImageConversion(TestCaseQt, ParametricTestCase):
+    """Tests conversion of QImage to/from numpy array."""
+
+    def testConvertArrayToQImage(self):
+        """Test conversion of numpy array to QImage"""
+        for format_, channels in [('Format_RGB888', 3),
+                                  ('Format_ARGB32', 4)]:
+            with self.subTest(format_):
+                image = numpy.arange(
+                    3*3*channels, dtype=numpy.uint8).reshape(3, 3, channels)
+                qimage = convertArrayToQImage(image)
+
+                self.assertEqual(qimage.height(), image.shape[0])
+                self.assertEqual(qimage.width(), image.shape[1])
+                self.assertEqual(qimage.format(), getattr(qt.QImage, format_))
+
+                for row in range(3):
+                    for col in range(3):
+                        # Qrgb has no alpha channel, not compared
+                        # Qt uses x,y while array is row,col...
+                        self.assertEqual(qt.QColor(qimage.pixel(col, row)),
+                                         qt.QColor(*image[row, col, :3]))
+
+
+    def testConvertQImageToArray(self):
+        """Test conversion of QImage to numpy array"""
+        for format_, channels in [
+                ('Format_RGB888', 3),  # Native support
+                ('Format_ARGB32', 4),  # Native support
+                ('Format_RGB32', 3)]:  # Conversion to RGB
+            with self.subTest(format_):
+                color = numpy.arange(channels)  # RGB(A) values
+                qimage = qt.QImage(3, 3, getattr(qt.QImage, format_))
+                qimage.fill(qt.QColor(*color))
+                image = convertQImageToArray(qimage)
+
+                self.assertEqual(qimage.height(), image.shape[0])
+                self.assertEqual(qimage.width(), image.shape[1])
+                self.assertEqual(image.shape[2], len(color))
+                self.assertTrue(numpy.all(numpy.equal(image, color)))