l lightness</dd>
     <dd><samp>luma</samp>: pixel luma</dd>

     <dd><samp>page.width</samp>: page width</dd>
     <dd><samp>page.height</samp>: page height</dd>
     <dd><samp>page.x</samp>: page x offset</dd>
     <dd><samp>page.y</samp>: page y offset</dd>

     <dd><samp>printsize.x</samp>: x printsize</dd>
     <dd><samp>printsize.y</samp>: y printsize</dd>

     <dd><samp>resolution.x</samp>: x resolution</dd>
     <dd><samp>resolution.y</samp>: y resolution</dd>

     <dd><samp>depth</samp>: image 