pan class="sd">            | Dict with parameters for forward transform </span>
<span class="sd">            | from xyz to cspace for reference data.</span>
<span class="sd">        :KLCH:</span>
<span class="sd">            | None, optional</span>
<span class="sd">            | Weigths for L, C, H </span>
<span class="sd">            | None: default to [1,1,1] </span>
<span class="sd">            | KLCH is not used when tf == &#39;camucs&#39;.</span>
<span class="sd">        :DEtype:</span>
<span class="sd