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PMS (Pantone Matching System): a widely used system of color matching and specification by numbers
Raster Art: A computer image that is composed of an array of pixels arranged in rows and columns measured in ppi (pixels-per-inch) or dpi (dots-per-inch). Common files formats are JPG, PSD (Photoshop), TIFF, BMP, or any image in Microsoft Word or PowerPoint. Enlarging a raster image reduces the clarity of how the image will print. For example, an image originally 4 inches wide at 150 dpi, will only be 2 inches wide at high resolution (300 dpi).
RGB: additive primary colors — Red, Green, Blue found in computer monitors
Registration Color: A color made up of all the colors used in a multicolor printing job
Spot Colors: in offset printing, colors specified in PMS inks other than the four standard process colors, CMYK (cyan, magenta, yellow and black)
Vector Art: Computer-designed image created by the manipulation of lines, not dots. In the simplest terms, a vector art file is a string of mathematical calculations — much like those used in basic geometry — which determine the shape of an object. A computer is many times more efficient at performing complex mathematical operations than it is at “scanning” a grid and assigning values to each little pixel (raster art). Thus, vector art is not only more versatile, it makes for smaller file sizes. Vector art is typically created using Adobe Illustrator (AI or EPS), Freehand (EPS) or CorelDraw.