  We present a unified Quantum Chromodynamics (QCD)-based description of
elastic and transition electromagnetic form factors involving the nucleon and
its resonances. We compare predictions made using a framework built upon a
Faddeev equation kernel and interaction vertices that possess QCD-like momentum
dependence with results obtained using a confining, symmetry-preserving
treatment of a vector$\,\otimes\,$vector contact-interaction in a widely-used
leading-order (rainbow-ladder) truncation of QCD's Dyson-Schwinger equations.
This comparison explains that the contact-interaction framework produces hard
form factors, curtails some quark orbital angular momentum correlations within
a baryon, and suppresses two-loop diagrams in the elastic and transition
electromagnetic currents. Such defects are rectified in our QCD-based approach
and, by contrasting the results obtained for the same observables in both
theoretical schemes, shows those objects which are most sensitive to the
momentum dependence of elementary quantities in QCD.
