Custom printed apparel is printed through two methods: screen printing and digital printing. To understand the difference, please visit this page. Because of the way we print designs on garments, we recommend using vector graphics to get the highest quality print. Please see below to understand the difference between the two types of graphics:

Raster

Raster graphics are made of pixels which are tiny squares of color information. A photograph is the most common type of raster graphic, and Adobe Photoshop is the most commonly used raster-based program. The quality and color of raster images are dependent on the “dots per inch” number.  Raster images can be modified down to each pixel, which is advantageous for precise editing. But the biggest downfall to raster images is that rasterized images become pixelated/blurry when enlarged. This is because there are a limited number of pixels in raster images. 

Vector

Vector graphics are shaped with points, lines, and curves. When you use vector based programs like InDesign and Illustrator, they follow mathematical equations to connect the dots and fill in the missing information between the dots. Vector images can be scaled up and down in size without losing definition and shape. Unlike rasterized images, they won't "combine" when you save them, so they are still layers that can be edited individually. On the other hand, vector images are limited in detail and effects in comparison to raster images.