1. A digital image inspection method using an image processing computer to check products of a printing material processing machine, the method comprising the following steps: using a plurality of image recording devices to record digital partial images of a printed image to be inspected; combining the digital partial images in the image processing computer to form a digital overall image, resulting in abutment edges arising in an overlap region of the partial images; using the image processing computer to then subject the digital overall image to an image inspection and to transmit a result of the image inspection to a control computer of the printing material processing machine; using the image processing computer to create a new image by using edge detection methods after combining the digital partial images to form the digital overall image, the new image containing only detected edges; using the image processing computer to create a further new image by using a known position of the abutment edges of the image recording devices, the further new image containing only regions with the abutment edges of the image recording devices; using the image processing computer to then overlay the new image and the further new image, resulting in a resultant image only containing edges along the abutment edges of the image recording devices; and using the image processing computer to apply the resultant image to the digital overall image to define masking zones in the resultant digital overall image not being checked by the image inspection.