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<p>Support for accessing the elements of a color base by semantic index. </p>
<p>semantic_at_c: Semantic channel accessors</p>
<p>The semantic index of an element is the index of its color in the color space. Semantic indexing allows for proper pairing of elements of color bases independent on their layout. For example, red is the first semantic element of a color base regardless of whether it has an RGB layout or a BGR layout. All GIL color base algorithms taking multiple color bases use semantic indexin