Additional Post Production In Photoshop - Seitz roundshot Instruction Manual

5.5 Additional post production in Photoshop

Colour noise
For details in the image that have a very high frequency it is possible that colour
artefacts occur. These artefacts are created because the resolution (frequency response)
of the lens is higher than that of the digital scan back or when photographing fine
structures (moiré). For example, Schneider and Rodenstock medium format lenses
often have a resolution (in line pairs per mm) which is higher than that of the D3 sensor.
These colour artefacts can be eliminated in the Seitz Roundshot software using the
"Colour noise reduction" tool. However some parts of the image might still suffer from
this artefact. In the case it is possible to select only these areas and apply a stronger
colour noise reduction in Photoshop using the filter "Reduce noise".
This method has two main advantages. It allows to get an image free from any colour
noise artefact. Also, because of its selection possibilities, the parts non affected by the
colour noise will remain unchanged i.e. no loss of quality.
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Instruction Manual Seitz 6x17 Digital - version 4.05 - May 2013- © by Seitz Phototechnik AG / Switzerland www.roundshot.ch