  ESO338-IG04 is a well known, local, luminous Blue Compact Galaxy. It has a
complex morphology and contains a central young starburst with compact young
star clusters. The galaxy was imaged using HST/ACS in the Lyman alpha line and
continuum. Using the Starburst99 synthetic spectra and other imaging data from
HST/WFPC2 we developed a technique that allows us to make the first
photometrically valid continuum subtraction for the LYa line. Our results are
in qualitative agreement with the models of LYa escape being regulated by
kinematical properties of the interstellar medium. The line-only image shows
LYa in both emission and absorption. Notably, emission is seen from central
bright young clusters and is in spatial agreement with the features present in
a longslit spectrum taken with HST/STIS. Diffuse LYa emission regions are seen
surrounding the central starburst where photons escape after one or more
resonant scatterings in HI. These regions dominate the total LYa output.
Photometry reveals a total LYa flux of 194 x 10^-14 erg/s/cm^2. Inside an
artificial aperture matching that of the IUE satelite, we measure a LYa flux
and equivalent width consistent with previous studies using the IUE. Analysis
of parameter dependencies show our technique to be largely parameter
independent, producing LYa maps indistinguishable from one another by eye and
with fluxes consistent with one another to better than 50%. By comparison of
LYa fluxes with Ha fluxes of a previous study, we estimate that each observed
LYa photon has undergone ~2 additional scatterings. We see that LYa line
closely correlate with other tracers of kinematics.
