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what's the difference?
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illustrator live trace and painting

Illustration software is distinguished from photo-editing software in that the result is an original construction, rather than the manipulation of a photograph. Illustration software uses vector-based tools such that the content is stored digitally as resolution-independent mathematical formulae describing lines (open paths), shapes (closed paths), and color fills, strokes or gradients. Vector paths are constructed of anchor points and path segments. Illustration tools typically create precise lines, shapes and patterns with well-defined edges and are superb for working with complex constructions such as maps and typography.