The eastern ejecta are brighter in this specific case. The combined field of view of the images spans 25 solar radii. The inner edge is at 1.6 solar radii. The dark circle marks the boundary between the C2 and the C3 field of view. Material is being ejected over east and the west limbs of the Sun.
Bright areas are coronal clouds moving outward.
Dark areas resemble the blown out streamer belt.