gth (nm) range of spectrum.</span>
<span class="sd">        :rgb2spec:</span>
<span class="sd">            | None, optional</span>
<span class="sd">            | Dict with base spectra for white, cyan, magenta, yellow, blue, green and red for each intent.</span>
<span class="sd">            | If None: use _BASESPEC_SMITS.</span>
<span class="sd">        </span>
<span class="sd">    Returns:</span>
<span class="sd">        :spec: </span>
<span class="sd">            | ndarray with spectrum or spectra (one fo