experimente cutycap , um 'www-snapshoter' baseado em webkit:
CutyCapt is a small cross-platform command-line utility to capture WebKit's rendering of a web page into a variety of vector and bitmap formats, including SVG, PDF, PS, PNG, JPEG, TIFF, GIF, and BMP. See IECapt for a similar tool based on Internet Explorer.
configure seu aplicativo de proteção de tela para capturar as fotos instantâneas do site.