Signs can make a big impact, depending on placement and quality of material. Visibility must be balanced with resolution quality. Photographs are difficult to manage, as they’re rarely shot at print resolution at the size of the sign. You can get away with 150 ppi (pixels per inch) but if the sign can be viewed at close range, it’s best to stick to 300 ppi. Because of the distance, billboards and building signs can get away with 100 ppi or even lower.
If your signage is outdoor in Florida, fading is a real problem. Stay away from large photos unless there is a UV guarantee. Stick with vector graphics and high-contrast colors. This includes auto wraps, window vinyls, sandwich boards for sidewalks and coroplast yard signs.