As cudak888 said, variances such as lighting, camera angle, printed colors, and monitor screen representations play into the different colors we all see on the same car. There was a discussion back in Dec 2014 on this forum on the Eleanor color. School Bus yellow is pretty close to the color you see on that car. In fact when Kit Sullivan talked to his "Contact" he was told that was pretty much what they used.
Ford told Bud Moore Engineering who was building Fords Boss 302 Trans Am cars that they wanted a color that would "Stand Out" on the track. So instead of Grabber Yellow or orange, School Bus Yellow was used. The color actually looked good on those cars and Eleanor!
Our Truck Sales/Fleet Manager had a binder with hundreds of paint chip colors with the manufacture and their number and the corresponding Ford ID number. There were actually several school bus yellow colors (The DOT maintenance trucks were school bus yellow) and even showed me the funky blue-green Heilig Meyers Furniture Truck color. (Anyone remember them and the same color T-Bird that they sponsored in NASCAR)?