To use type or a shape in a clipping mask, the type or shape layer must first be raster-ized, or changed from vector graphics into a normal object layer. Rasterizing changes the vector graphic into a bitmapped object, one that is made up of a fixed number of colored pixels. Vector graphics are made up of lines and curves defined by mathematical objects called vectors. The advantage to using vector graphics for shapes is that they can be resized and moved without losing image quality.
Bitmapped images contain a fixed number of pixels; as a consequence, they can appear jagged and lose detail when resized.
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