<tool id="ip_histogram_equalization" name="Histogram equalization" version="0.0.1">
   <description>automatic histogram equalization</description>
   <requirements> 
        <requirement type="package" version="0.14.2">scikit-image</requirement>
        <requirement type="package" version="1.15.4">numpy</requirement>
        <requirement type="package" version="5.3.0">pillow</requirement>
        <requirement type="package" version="0.15.1">tifffile</requirement>
   </requirements>
   <command detect_errors="aggressive">
   <![CDATA[
   python '$__tool_directory__/histogram_equalization.py' '$input' '$output' $h_type
   ]]>
   </command>
   <inputs>
        <param name="input" type="data" format="tiff" label="Source file" />
        <param name="h_type" type="select" label="Histogram Equalization Algorithm">
          <option value="default">Stretching</option>
          <option value="clahe" selected="True">CLAHE</option>
        </param>
    </inputs>
    <outputs>
       <data format="tiff" name="output" />
    </outputs>
    <tests>
        <test>
            <param name="input" value="sample.tif"/>
            <output name="output" value="out.tif" ftype="tiff" compare="sim_size"/>
            <param name="h_type" value="default"/>
        </test>
    </tests>
    <help>
        Applies histogram equalization to an image.
    </help>
    <citations>
        <citation type="doi">10.1016/j.jbiotec.2017.07.019</citation>
    </citations>
</tool>