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Resolution charts
As part of our image quality testing for the Ricoh PX, we've shot our resolution chart.
If you view our crops of the resolution chart's central section at 100% (or Actual Pixels) you will see that, for example, at ISO 100 the Ricoh PX is capable of resolving up to around 20 (line widths per picture height x100) in its highest quality JPEG files.
Examining images of the chart taken at each sensitivity setting reveals the following resolution scores in line widths per picture height x100:
ISO 100, score: 20 (see full image)
ISO 200, score: 20 (see full image)
ISO 400, score: 18 (see full image)
ISO 800, score: 16 (see full image)
ISO 1600, score: 14 (see full image)
ISO 3200, score: 12 (see full image)
Noise and dynamic range
These graphs were produced using data generated by DXO Analyzer.
We shoot a specially designed chart in carefully controlled conditions and the resulting images are analysed using the DXO software.
Signal to noise ratio
A high signal to noise ratio (SNR) indicates a cleaner and better quality image.
JPEG images from the Ricoh PX are consistently lower than the Canon PowerShot 220 HS, Nikon Coolpix S4150 and Panasonic Lumix DMC-FS37 upto a sensitivity of ISO 3200 where it just has the edge over the Nikon Coolpix S4150. However these results show that images upto a sensitivity of ISO 3200 will still produce good images with visible but not substantial noise appearing from ISO 1600.
For a full explanation of what our resolution charts mean, and how to read them please click here to read the full article.
Dynamic range
This chart indicates that the Ricoh PX's JPEGs show a gradual decline of dynamic range as the sensitivity increases, and is consistently lower than the Canon PowerShot 220 HS, Nikon Coolpix S4150 and Panasonic Lumix DMX-FS37. This shows that from ISO 400 shadow and highlight detail could easily be lost from images.
For more more details on how to interpret our test data, check out our full explanation of our noise and dynamic range tests.
