<tool id="filter_invert" name="Filter - Invert" version="1.0.2">

	<description>Apply an invert filter on the image.</description>

	<command interpreter="python" >
		#if (str($input.ext) == 'jpg'):
			pil_filter.py $input $output invert jpeg
        #else:
			pil_filter.py $input $output invert ${input.ext}
		#end if 
  	</command>

	<inputs>
		<param name="input" type="data" format="png,jpg,tif,zip" label="Input image" help="Original RGB or grayscale image." />
	</inputs>
	
	<outputs>
		<data format="input" name="output" metadata_source="input" label="Invert on ${input.display_name}"/>
	</outputs>
	
	<help>
		Invert the image (colours). 
  	</help>

  	<tests>
  		<test>
  			<param name="input" value="images/sydney.jpg" />
  			<output name="output" file="images/sydney-invert.jpg" />
  		</test>
  	</tests>

</tool>