Does anyone know what the typical (highway) billboard size is, and what is typical resolution needed for pixel based imagery? I have heard anywhere from 75 ppi to 150 ppi - thoughts?
The average size is 48' x 14' and at full size they are usually around 20ppi. But rarely do you work full size, most of the time it's to what they call 1/4 scale, confusing, because what they mean is 1/4" = 1'. I would call that 1/48 scale. They always state the dimensions height first and then width so they call their standard size 14x48. Must be a holdover from the pre-PS days.
The specs for large signage are all over the map so you need to get good information from the vendor before you start.
Thank you Paul. That's exactly the info I was looking for, very helpful before I tackle this project. I was starting to freak out wondering how I would interpolate a photo that size - I was thinking I would have to increase it to 150 ppi. I'll verify once I find out who the client is going to use as a vendor ~ thanks so much!