Making a Hollywood Hills Banner?

Here is what I would like a banner printed on decent paper that says: HOLLYWOODS with the Hollywood Hills background. Black and White print. Notice the 'S' on Hollywood. You can easily create your own Hollywood Hills Banner by googling 'make your own Hollywood hills banner online'. I have done so already. My problem is that I can't get enough resolution to enlarge the picture to 12 inches high and 6 feet long. I'd like the banner printed on decent paper to decoupage onto a board. Thanks so much for any info.