  Rest frame Stromgren photometry (3500A, 4100A, 4750A and 5500A) is presented
for 509 galaxies in 17 rich clusters between z=0 and z=1 as a test of color
evolution. Our observations confirm a strong, rest frame, Butcher-Oemler effect
where the fraction of blue galaxies increases from 20% at z=0.4 to 80% at
z=0.9. We also find that a majority of these blue cluster galaxies are composed
of normal disk or post-starbursts systems based on color criteria. When
comparing our colors to the morphological results from HST imaging, we propose
that the blue cluster galaxies are a population of late-type, LSB objects who
fade and are then destroyed by the cluster tidal field. After isolating the red
objects from Butcher-Oemler objects, we have compared the mean color of these
old, non-star forming objects with SED models in the literature as a test for
passive galaxy evolution in ellipticals. We find good agreement with single
burst models which predict a mean epoch of galaxy formation at z=5. Tracing the
red envelope for ellipticals places the earliest epoch of galaxy formation at
z=10.
