While inking can involve tracing pencil lines in a literal sense, it also requires interpreting the pencils, giving proper weight to the lines, correcting mistakes, and making other creative choices. The look of a penciler's final art can vary enormously depending on the inker. A pencil drawing can have an infinite number of shades of grey, depending on the hardness of the graphite and the pressure applied by the artist. By contrast, an ink line generally can be only solid black. Accordingly, the inker has to translate pencil shading into patterns of ink, as for example by using closely spaced parallel lines, feathering, or cross-hatching.