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Bauer, Peter
Illustrator World
2005

Abstract:

It's the subtle transitions in color that give the illusion of three dimensions in two-dimensional artwork. Gradients are used to simulate light hitting a curved or angular surface. The gradual blending from one color to another is the key. Linear and radial gradients can be used effectively to show flat and rounded shapes, but Illustrator's gradient meshes are best for creating complex shapes.