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Generally speaking Photoshop brokers in pixels or so-called Raster Art. But the program dabbles in vectors on the side. A vector, in case you don't know, is a mathematically defined outline. The outline traces a shape. Photoshop renders that shape to pixels on the fly. But at its heart, the shape is just a bunch of math, meaning that it can be scaled or transformed without any degradation in quality. Ever. One way to scale vectors is to print them to a postscript compatible printer.
Regardless of the resolution of the image, it might be 3 pixels wide. The vector renders at the full resolution of the output device. But few of us own postscript printers and other printers don't work this way. For the rest of us, there is Free Transform and Image Size. Increase the size of the shape or image and the vector scale away, always remaining razor sharp. Vectors are a world apart from anything we have seen and in Photoshop vectors go by one of three names, shape layers, vector masks and paths. But really, they are all the same thing as you will learn in the following exercises.
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