typically market clip art by focusing either on quantity or vertical market specialty. The marketing method often goes hand in hand with the art style of the clip art sold. To compete largely on quantity, some clip art vendors must produce or license new and old clip art collections in volume. Clip art marketed in this way is often less expensive but simpler in structure and detail, as is typified by cartoons, line art, and symbols. Clip art which is sold according to smaller, specialized subject genres tends to be more complex, modern, detailed, and expensive. File formats Electronic clip art is available in several different file formats. It is important for clip art users to understand the differences between file formats so that they can use an appropriate image file and get the resolution and detail results they need. Clip art file formats are divided into 2 different types: bitmap or vector graphics. Bitmap (or "rasterized") file formats are used to describe rectangular images made up of a grid of colored or grayscale pixels. Scanned photos, for example, make use of a bitmap file format. Bitmap images are always limited in quality by their resolution, which must be fixed at the time the file is created. If the image is not rectangular, then it is saved on a default background color (usually white) defined by the smallest bounding rectangle in which the image fits. Because of their fixed resolution, printing bitmap images can easily produce grainy, jaggy, or blurry results if the resolution is not ideally suited to the printer resolution. In addition, bitmap images become grainy when they are scaled larger than their intended resolution. A few bitmap file formats (such as Apple's PICT format) support alpha channels, which allow bitmap images to have transparent backgrounds or an image selection which uses antialiasing. Most common web-based file formats such as GIF, JPEG, and PNG are bitmap file formats. The GIF File format is one of the simplest, low-resolution bitmap file formats, only supporting 256 colors per image. As a result, however, GIF files can be extremely small in file size. Other common bitmap file formats are BMP (Windows bitmap), TGA, and TIFF. Most clip art is provided in a low resolution, bitmap file format which is unsuitable for scaling, transparent backgrounds, or good-quality printed materials. However, bitmap file formats are ideal for photos, especially when combined with lossy