2 <effect tag="chroma" id="chroma">
3 <name>Blue Screen</name>
4 <description>Make selected color transparent</description>
5 <author>Charles Yates</author>
6 <parameter type="color" name="key" default="0x0000FF">
9 <parameter type="constant" name="variance" max="100" min="0" factor="100" default="15">