--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scale_image.xml	Mon Jan 07 05:39:54 2019 -0500
@@ -0,0 +1,59 @@
+<tool id="scale_image" name="Scale Image" version="0.2">
+  <description>Scales image</description>
+  <requirements>
+    <requirement type="package" version="0.14.0">scikit-image</requirement>
+    <requirement type="package" version="1.1.0">scipy</requirement>
+  </requirements>
+  <command>
+        <![CDATA[
+        python '$__tool_directory__/scale_image.py' '$input' ./out.png
+        #if $use_scale_option.use_scale == 'true'
+          $use_scale_option.scale
+        #else if $use_scale_option.use_scale == 'false'
+          '[$use_scale_option.scale_x, $use_scale_option.scale_y]'
+        #end if
+        $order
+
+        &&
+        mv ./out.png '$output'
+        ]]>
+  </command>
+  <inputs>
+    <param name="input" type="data" format="png" label="Image file"/>
+    <conditional name="use_scale_option"><!--a third option (using one integer as percentage scaling) could still be implemented-->
+          <param label="Lock scaling between image dimensions" name="use_scale" type="select">
+              <option selected="true" value="true">Lock</option>
+              <option value="false">Individual scales</option>
+          </param>
+          <when value="true">
+            <param name="scale" size="4" type="float" value="1.0" label="Scaling factor" />
+          </when>
+          <when value="false">
+            <param name="scale_x" size="4" type="integer" value="100" label="New height of the image in pixels" />
+            <param name="scale_y" size="4" type="integer" value="100" label="New width of the image in pixels" />
+          </when>
+    </conditional>
+    <param name="order" type="select" label="Interpolation method">
+      <option value="0">Nearest-neighbor</option>
+      <option value="1" selected="true">Bi-linear</option>
+      <option value="2">Bi-cubic</option>
+    </param>
+  </inputs>
+  <outputs>
+    <data format="png" name="output"/>
+  </outputs>
+    <tests>
+      <test>
+        <param name="input" value="sample1.png"/> <!--continue here-->
+        <param name="use_scale_option.use_scale" value="false"/>
+        <param name="use_scale_option.scale_x" value="200"/>
+        <param name="use_scale_option.scale_y" value="150"/>
+        <param name="order" value="0"/>
+        <output name="output" value="out2.png" ftype="png" compare="sim_size"/>
+      </test>
+    </tests>  
+  <help>This tool scales an image using the scaling factor.</help>
+  <citations>
+      <citation type="doi">10.1016/j.jbiotec.2017.07.019</citation>
+  </citations>
+</tool>