Simple painted brush strokes are usually just some kind of image processing, ranging from color correction to color replacement, but the brush can also be used to apply everything from blurring to localized warping. The effect will be limited to the extent of the brush size, and may be applied with soft edges around the periphery of the brush's path, but the operations should all be familiar. What's more, the “brush” that is used in digital painting is really nothing more than a series of composites that are applied along the path on which the brush moves. Even the most basic paint packages will allow the user to color correct an image, to apply geometric transformations, and to composite separate layers into a single scene. In fact, digital paint programs offer a huge range of tools, many of them similar or identical in function to the compositing tools that we have discussed throughout this book. Although there are digital tools that mimic this paradigm (usually with a stylus and a tablet), digital painting is far more than just a method for drawing colored lines into an image. The term “painting” still evokes the image of a brush and a canvas. RON BRINKMANN, in The Art and Science of Digital Compositing (Second Edition), 2008 Digital Painting
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