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diff --git a/src/silx/resources/opencl/image/cast.cl b/src/silx/resources/opencl/image/cast.cl
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+++ b/src/silx/resources/opencl/image/cast.cl
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+/*
+ *   Project: SILX: Alogorithms for image processing
+ *
+ *   Copyright (C) 2013-2017 European Synchrotron Radiation Facility
+ *                           Grenoble, France
+ *
+ *   Principal authors: J. Kieffer (kieffer@esrf.fr)
+ *
+ * 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.
+ */
+
+#ifndef NB_COLOR
+    #define NB_COLOR 1
+#endif
+
+
+/**
+ * \brief Cast values of an array of uint8 into a float output array.
+ *
+ * :param array_input:   Pointer to global memory with the input data as unsigned8 array
+ * :param array_float:   Pointer to global memory with the output data as float array
+ * :param width:         Width of the image
+ * :param height:        Height of the image
+ */
+kernel void u8_to_float( global unsigned char  *array_input,
+                         global float *array_float,
+                         const int width,
+                         const int height)
+{
+    //Global memory guard for padding
+    if ((get_global_id(0) < width) && (get_global_id(1)<height))
+    {
+        int i = NB_COLOR * (get_global_id(0) + width * get_global_id(1));
+        for (int c=0; c<NB_COLOR; c++)
+        {
+            array_float[i + c] = (float) array_input[i + c];
+        } //end loop over colors
+    } //end test in image
+} //end kernel
+
+/**
+ * \brief Cast values of an array of uint8 into a float output array.
+ *
+ * :param array_input:   Pointer to global memory with the input data as signed8 array
+ * :param array_float:   Pointer to global memory with the output data as float array
+ * :param width:         Width of the image
+ * :param height:        Height of the image
+ */
+kernel void s8_to_float( global char  *array_input,
+                         global float *array_float,
+                         const int width,
+                         const int height)
+{
+    //Global memory guard for padding
+    if ((get_global_id(0) < width) && (get_global_id(1)<height))
+    {
+        int i = NB_COLOR * (get_global_id(0) + width * get_global_id(1));
+        for (int c=0; c<NB_COLOR; c++)
+        {
+            array_float[i + c] = (float) array_input[i + c];
+        } //end loop over colors
+    } //end test in image
+} //end kernel
+
+
+/**
+ * \brief cast values of an array of uint16 into a float output array.
+ *
+ * :param array_input:    Pointer to global memory with the input data as unsigned16 array
+ * :param array_float:    Pointer to global memory with the output data as float array
+ * :param width:          Width of the image
+ * :param height:         Height of the image
+ */
+kernel void u16_to_float(global unsigned short  *array_input,
+                         global float *array_float,
+                         const int width,
+                         const int height)
+{
+    //Global memory guard for padding
+    if ((get_global_id(0) < width) && (get_global_id(1)<height))
+    {
+        int i = NB_COLOR * (get_global_id(0) + width * get_global_id(1));
+        for (int c=0; c<NB_COLOR; c++)
+        {
+            array_float[i + c] = (float) array_input[i + c];
+        }           //end loop over colors
+    } //end test in image
+} //end kernel
+
+/**
+ * \brief cast values of an array of int16 into a float output array.
+ *
+ * :param array_input:    Pointer to global memory with the input data as signed16 array
+ * :param array_float:    Pointer to global memory with the output data as float array
+ * :param width:          Width of the image
+ * :param height:         Height of the image
+ */
+kernel void s16_to_float(global short *array_input,
+                         global float *array_float,
+                         const int width,
+                         const int height)
+{
+    //Global memory guard for padding
+    if ((get_global_id(0) < width) && (get_global_id(1)<height))
+    {
+        int i = NB_COLOR * (get_global_id(0) + width * get_global_id(1));
+        for (int c=0; c<NB_COLOR; c++)
+        {
+            array_float[i + c] = (float) array_input[i + c];
+        } //end loop over colors
+    } //end test in image
+}//end kernel
+
+/**
+ * \brief cast values of an array of uint32 into a float output array.
+ *
+ * :param array_input:    Pointer to global memory with the input data as unsigned32 array
+ * :param array_float:    Pointer to global memory with the output data as float array
+ * :param width:          Width of the image
+ * :param height:         Height of the image
+ */
+kernel void u32_to_float(global unsigned int  *array_input,
+                         global float *array_float,
+                         const int width,
+                         const int height)
+{
+    //Global memory guard for padding
+    if ((get_global_id(0) < width) && (get_global_id(1)<height))
+    {
+        int i = NB_COLOR * (get_global_id(0) + width * get_global_id(1));
+        for (int c=0; c<NB_COLOR; c++)
+        {
+            array_float[i + c] = (float) array_input[i + c];
+        } //end loop over colors
+    } //end test in image
+}//end kernel
+
+
+/**
+ * \brief convert values of an array of int32 into a float output array.
+ *
+ * :param array_input:    Pointer to global memory with the data in int
+ * :param array_float:    Pointer to global memory with the data in float
+ * :param width:          Width of the image
+ * :param height:         Height of the image
+ */
+kernel void s32_to_float(global int  *array_input,
+                         global float  *array_float,
+                         const int width,
+                         const int height)
+{
+    //Global memory guard for padding
+    if ((get_global_id(0) < width) && (get_global_id(1)<height))
+    {
+        int i = NB_COLOR * (get_global_id(0) + width * get_global_id(1));
+        for (int c=0; c<NB_COLOR; c++)
+        {
+            array_float[i + c] = (float) array_input[i + c];
+        } //end loop over colors
+    } //end test in image
+}//end kernel
+