When keying the drawing (and developing tonal values in general) it’s important that the shapes of the tonal areas are captured accurately. Continuing recursively in this way, the tonal values eventually meet in the middle, and the drawing (or the relevant part of the drawing) is complete. Again, this can be done procedurally, by identifying and shading/highlighting the areas which are slightly lighter than the darkest darks and slightly darker than the lightest lights. Once the key is established, and the lightest and darkest values are in place, the intermediate values need to be introduced. it’s easy to find the lightest lights and the darkest darks). This establishes the entire tonal range of the drawing, which is called the key of the drawing.Įstablishing the key is straightforward, and doesn’t require much visual interpretation (i.e. For the lightest areas, highlight them as light as you can/want.
For the darkest areas, shade them as dark as you can/want. Start by identifying the absolute darkest and absolute lightest areas of the drawing. Thus, instead of relying on visual inferences, tonal values can be better approximated through a simple, not-so-interpretative procedure.
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