  The X-ray populations of Local group galaxies have been classified in detail
by Einstein, ROSAT and ASCA revealing a mix of binaries, supernova remnants and
HII regions. However, these observatories were unable to resolve X-ray sources
in galaxies beyond the local group. With Chandra's exquisite spatial resolution
we are able to resolve sources in a sample of nearby galaxies. We show that
there are highly significant differences in the X-ray colors of sources in
bulge and disk systems. These differences can be used as a basis to classify
sources as low and high mass X-ray binaries, supernova remnants and supersoft
sources. While it is impossible to identify any individual source on the basis
of X-ray color alone, the observations presented here suggest that it is
possible to separate sources into groups dominated by a single type of source.
This classification scheme is likely to be very useful in population studies,
where it is crucial to distinguish between different classes of objects.
