  We present photometric measurements for the galaxies - and when possible
their bulges and disks - in the 0.05<z<0.0585 groups of the Zurich
Environmental Study (ZENS); these measurements include (B-I) colors, color
gradients and maps, color dispersions, as well as stellar masses and
star-formation rates. The ZENS galaxies are classified into quenched,
moderately star-forming, and strongly star-forming using a combination of
spectral features and FUV-to-optical colors; this approach optimally
distinguishes quenched systems from dust-reddened star-forming galaxies. The
latter contribute up to 50% to the (B-I) "red sequence" at ~10^10Msun. At fixed
morphological or spectral type, we find that galaxy stellar masses are largely
independent of environment, and especially of halo mass. As a first utilization
of our photometric database, we study, at fixed stellar mass and Hubble type,
how (B-I) colors, color gradients and color dispersion of disk satellites
depend on group mass (M_GROUP), group-centric distance (R/R_200) and
large-scale structure overdensity. The strongest environmental trend is found
for disk-dominated satellites with M_GROUP and R/R_200. At M<10^10 Msun,
disk-dominated satellites are redder in the inner regions of the groups than in
the outer parts. At M>10^10 Msun, these satellites have shallower color
gradients in higher mass groups and in the cores of groups compared with lower
mass groups and the outskirts of groups. Stellar population analyses and
semi-analytic models suggest that disk-dominated satellites undergo quenching
of star formation in their outer disks, on timescales ~2 Gyr, as they
progressively move inside the group potential.
