A printer system for printing an image on an object and verifying its accuracy. The printer system generally includes a printer which is adapted to print an image on a printing medium such as a roll of web paper. The image may include product data related to a product being stored in product packaging, such as a machine-readable code. The product data may be printed on a label to be affixed to product packaging, or on the product packaging itself. A reference image is printed on the printing medium and a sensor scans the printed image. By comparing the printed image to the reference image, a computing device may detect defects and distinguish between a defective printed image and a correct printed image.