I would like to use a photo taken at the site as a background image for my ArchiCAD model. The final rendering needs to be at least 11x17" and I am having trouble getting a photo that has a high enough resolution so that the background image is crisp when I render it at that size. The highest resolution I can get from my camera is 2080x1544. Any help would be greatly appreciated.
If you really need a higher resolution photo, you could upscale, antialias and maybe denoise your photo in a photo editor like Photoshop. You could also try Adobe Camera Raw's Enhance function if you've got the latest Photoshop and have a compatible file format.