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diff --git a/silx/gui/utils/test/test_image.py b/silx/gui/utils/test/test_image.py
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+++ b/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.gui.test.utils import TestCaseQt
+from silx.gui.utils import _image
+
+
+class TestQImageConversion(TestCaseQt):
+    """Tests conversion of QImage to/from numpy array."""
+
+    def testConvertArrayToQImage(self):
+        """Test conversion of numpy array to QImage"""
+        image = numpy.ones((3, 3, 3), dtype=numpy.uint8)
+        qimage = _image.convertArrayToQImage(image)
+
+        self.assertEqual(qimage.height(), image.shape[0])
+        self.assertEqual(qimage.width(), image.shape[1])
+        self.assertEqual(qimage.format(), qt.QImage.Format_RGB888)
+
+        color = qt.QColor(1, 1, 1).rgb()
+        self.assertEqual(qimage.pixel(1, 1), color)
+
+    def testConvertQImageToArray(self):
+        """Test conversion of QImage to numpy array"""
+        qimage = qt.QImage(3, 3, qt.QImage.Format_RGB888)
+        qimage.fill(0x010101)
+        image = _image.convertQImageToArray(qimage)
+
+        self.assertEqual(qimage.height(), image.shape[0])
+        self.assertEqual(qimage.width(), image.shape[1])
+        self.assertEqual(image.shape[2], 3)
+        self.assertTrue(numpy.all(numpy.equal(image, 1)))
+
+
+def suite():
+    test_suite = unittest.TestSuite()
+    test_suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(
+        TestQImageConversion))
+    return test_suite
+
+
+if __name__ == '__main__':
+    unittest.main(defaultTest='suite')