  Our goal is the study of color effects on the $J/\psi$ and $D$ mesons
production, as well as the study of their elastic production. We use the Color
Evaporation Model (CEM), where a single factor takes into account the
probability that the $c\bar{c}$ produced in a color octet state turns into a
physical (colorless) quarkonium or continues as a color octet, producing open
charm.
  The main result of this work, besides investigating the range of
applicability of the CEM, is to show that this model can be used to describe
the elastic processes of $J/\psi$ and open charm photoproduction without the
use of a Pomeron.
