  We compare V-band structural properties of cluster and field galaxies, to
test whether much of the current cluster membership resulted from the
transformation of infalling spirals into red early types. We use 140 galaxies
from 3 z<0.6 Abell clusters (A85,A496,A754 - spectroscopic membership) with
blue colors, and compare them to 80 field galaxies with similar colors and
luminosities. Our previous work (McIntosh et al. 2004, ApJ submitted) shows
that the blue galaxies in these local clusters are a recently infalling
population that has yet to encounter the dense core. We quantify galaxy
internal structure from 2D B/D decompositions using GIM2D. We observe
structural differences between blue galaxies in clusters, compared to the
field. Most blue cluster members are physically smaller and fainter than their
field counterparts. At a matched size and luminosity, recent arrivals are
smoother in appearance, yet their total light is as disk-dominated as in normal
field spirals. Moreover, 50% of blue cluster galaxies have blue cores or
globally blue color profiles, in contrast with field spirals that have
typically red color gradients. Without environment dependent evolution outside
of cluster cores, we expect blue disk galaxies in clusters and the field to
have similar morphologies, sizes, and color gradients. We show conclusively
that galaxy properties do reflect the environment in which the galaxy is found.
The data show that the transformation of accreted galaxies is not confined to
the dense cluster core. The overall properties of bluer cluster galaxies are
best explained by environment-driven transformation of accreted field spirals,
and our results suggest that the processes that govern color and morphological
evolution occur separately. (abridged)
