We report on the Atmospheric Imaging Assembly (AIA) observations of plasma outflows from a coronal dimming during the 2015 April 28 filament eruption. After the filament started to erupt, two flare ribbons formed, one of which developed J-shaped extension (hook) enclosing a core dimming region. Along multiple funnels located inside this dimming region, outward-directed motions of plasma started to be visible in time-distance diagrams produced using the 171 and 193 filter channel data. These motions, which typical velocities ranged between 70 and 140 km/s, were generating nearly-uniform strip-like pattern for more than five hours. Based on this we suggest that this motion was a signature of outflows. Interestingly, the pattern generated by the outflows and their velocities were similar to those we observed in an ordinary coronal hole located in the vicinity. This indicates that the outflows are signatures of solar wind flowing along the open-field structures of the dimming region. To our knowledge, our observations present the first imaging evidence for plasma outflows from a dimming region.