tailieunhanh - Adobe Illustrator CS4 bible phần 7

Part II Putting Illustrator to Work quite often, and they seem to have a good point at first. Upon further study, however, it becomes apparent that blends are quite different from gradients, both in form and function. You use gradients only as fills for paths. You can make gradients either linear or radial, meaning that color can change from side to side, top to bottom, or from an interior point to the outside. Every gradient can have as many distinct colors in it as you can create. Gradients are simply an easier way to create blends that change only in color, not. | Part II Putting Illustrator to Work quite often and they seem to have a good point at first. Upon further study however it becomes apparent that blends are quite different from gradients both in form and function. You use gradients only as fills for paths. You can make gradients either linear or radial meaning that color can change from side to side top to bottom or from an interior point to the outside. Every gradient can have as many distinct colors in it as you can create. Gradients are simply an easier way to create blends that change only in color not in shape or size. For more on gradients see Chapter 7. Blends on the other hand are a series of transformed paths between two end paths. The paths between the end paths mutate from one end path into the other. All the attributes of the end paths change throughout the transformed paths including shape size and all paint style attributes. The major benefit is that you can blend multiple colors at one time. Blends can be incredibly flexible when it comes to creating photorealistic changes in color if you plan ahead. Changes to blends aren t really changes at all instead they re deletions of the transformed objects and changes in the attributes of the end paths. If you know what you want blending colors can take on an incredibly realistic look by changing the shapes of the blend s end paths just slightly. But even more useful than creating realistic changes in color is blending s capability to transform shapes from one shape to another this is typically called morphing as shown in Figure . With a bit of practice and the information in this chapter you can transform any illustration into another illustration. There s a limit to the complexity of the illustrations that you can transform but the limit is due more to the time it takes to create the blends than to limitations inherent in Illustrator. Because blends work on both stroke and fill attributes of objects you can create some really exciting effects that aren