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This is a measure of the random digital noise in a photo compared to real image data. The higher the signal to noise ratio the better. We test this in laboratory conditions using DxO Analyzer.
JPEG signal to noise ratio analysis: At the lowest sensitivity setting the PEN-F achieves the joint highest score here, indicating that images have a good level of detail and low noise. The score stays comparatively high through the sensitivity range though eclipsed slightly by rival cameras.
Raw (converted to TIFF) signal to noise ratio analysis: Although the PEN-F score well, it can't match the heights of the Panasonic GX8's scores. Unlike the JPEG scores, at higher sensitivity settings the results for the converted raw files in High Res Shot mode are better than the standard mode's.
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