When screen printing vector art is required. When the artwork is in vector format you don't have to worry about resolution, you can resize it to any size and loose no detail. The type is also sharper, and edges are smoother. The colors in a vector graphic can be separated versus a .jpeg which is a flat file with no layers.
Vector art is the use of geometrical primitaves such as points, lines, curves, and shapes which are all based on mathematical equations to represent images in computer graphics. Vector files store the lines, shapes and colors that make up an image. A vector graphics program uses the mathematical formulas to construct the screen image, building the best quality image possible given the screen resolution. One of the most popular programs for creating vector art is Adobe Illustrator.
Screen printing, also known as silk screen, is a printing technique that uses woven mesh to support an ink-blocking stencil. The attached stencil forms open areas of mesh that transfer ink or other printable material which can be pressed through the mesh as a sharp edged image onto a substrate. Below is a photo of the screen printing process.
Above is an example of a one color imprint. When doing two colors two screens are needed and are run seprately. Below is an example using Ad-Star's logo.
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