One scanner taught in the present specification may be provided with a processor and a memory that stores computer-readable instructions. The computer-readable instructions, when executed by the processor, may cause the scanner to perform: obtaining a scan request from a terminal device; determining a target scan resolution based on software-related information included in the scan request; generating scan image data having the target scan resolution; and supplying the scan image data to the terminal device. The software-related information is information relating to a software installed in the terminal device and used by the terminal device for supplying the scan request to the scanner.