Image capture and re-rendering

Go to website: [login to view URL] You will see a sky chart with stars for a given date and geographic location. The default date and location as shown is the wrong one. The final skychart should have a different date and location. But this is detail. I would like to have a high-resolution and nice version of the skychart. I contacted Sky & Telescope about this but they say this is currently not possible. In the upper right corner one can click a print button and obtain a PDF file with a black/whit version of the sky chart. But the buildings on the horizon and other graphics are missing. The goal of this project is to grab the sky chart (zooming in with your browser) and then render all text to appear sharp and nice and clear. Also lines should appear clear and sharp. In principle everything should appear clear and sharp. The final goal is to have a PDF file that can be used to print a nice A3 sized poster which stands out really nice. Further some extra text annotations should be done here and there the details of which are to be discussed later (but this is just simple text that should harmonize with the other default text).