Shadow Painting: Not all shadows are equal. There are in fact two very different kinds of shadows that occur in any subject -- cast shadows and form shadows. Identifying these and approaching them differently, rather than just painting a generic ‘shadow’, will enhance any painting. So what is the difference between a cast shadow and a form shadow?
Cast Shadow: A cast shadow is what we generally think of as a shadow. It’s a shadow created by something blocking the light source. For example, the shadow of a tree, created by the sunlight, that falls on the ground. Or the shadow on a tabletop from an apple sitting on it. Or the shadow of a nose falling on a cheek.
A cast shadow is the darker type of shadow, because it’s created by the light source being blocked.
Form Shadow: A form shadow is the shadow on a subject on the side that is not directly facing the light source. Or what you might think of as the parts of the subject ‘in the shadow’ because they don’t have direct light on them (but also don’t have a cast shadow falling on them).
A form shadow has a softer or less defined edge to it than a cast shadow. It is lighter than a cast shadow because it’s not created directly by a blocked light source. Form shadows are subtle shadows, essential for making a subject appear three dimensional rather than flat. The changes in forms shadows requires very careful observation -- squinting at the subject often help you see them more clearly. If most of the subject is in direct light, there will be very little form shadow in it.
Shadow Painting Tips:
* Squinting at a subject helps make the areas of light and dark clearer.
* Remember, shadows are not simply ‘black’. Use darker tones of the colors in the objects, or dark complementary colours.
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