"sd">        :tf:</span>
<span class="sd">            | _CSPACE, optional</span>
<span class="sd">            | Color space to use for color difference calculation.</span>
<span class="sd">        :fwtft:</span>
<span class="sd">            | {}, optional</span>
<span class="sd">            | Dict with parameters for forward transform </span>
<span class="sd">              from xyz to cspace for test data.</span>
<span class="sd">        :fwtfr: </span>
<span class="sd">            | {}, optional </span>
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