For detailed, nonmacro types of shots, the E-30 exhibits an excellent noise profile up to ISO 800, with a minimal degradation in detail at ISO 800. Shots taken at ISO 1600 start to look a bit soft, but remain usable, and at ISO 3200 you start to see some color noise as well as artifacts from the noise suppression algorithms. However, depending upon the content of the photos, they may be surprisingly good even at ISO 3200 (see subsequent slides).
Close-up shots fare better under Olympus' noise reduction algorithms than mid- to long-distance ones. You can start to see some of the "grain" effect of the noise reduction, but the detail remains excellent. For example, you can still make out the layers of the circuit board. (1/80 sec, f5.0)
Clearly you can see color noise at ISO 3200, and the pattern of the noise-reduction algorithm is quite visible. And especially under indoor lighting, the color balance tends to shift a bit--the alchemists at Olympus manage to turn silver into gold. Nonetheless, photos like this still look quite good. (1/50 sec, f5.0)
In general, it seems like the E-30 will generally sacrifice highlights in favor of visible shadow detail rather than underexpose to preserve highlights as most cameras in its class favor--the latter is a better approach, since shadow detail can always be brought out in software but highlights are gone for good. In even lighting the exposures are OK. (1/125 sec, f5.6, ISO 100, pattern metering)