% If False Then %>
ISO Sensitivity / Noise levels (contd.)
Noise filter settings
The graph below shows the effect of setting the Noise Filter to any one of the four levels at ISO 800, ISO 1600 and ISO 3200. The four settings are fairly evenly spaced (though it's obvious that the 'standard' setting is fairly strong).
Below are the crops for the graph data above, plus ISO 400 for comparison (the effect of the noise filter on fine detail is relatively light at ISO 400 and below).
At anything over ISO 800 noise levels at the 'low' and 'off' settings are pretty high, but as the crops below show the main problem is luminance noise (so the images look grainy rather than being plagued by color blotches). This leads us to believe that even in the 'Off' setting Olympus is applying some chroma NR to the JPEGs at higher ISOs. We'd recommend using 'Low' for most shots in the ISO 400-1600 range; the grain isn't hideous and the detail retention is considerably higher.