•
ROC
–
Restoration of Colours
– a software method of restoring the colours of faded original
slides, also available in some image processing programs. My hobby is transport photography
and I have a large collection of pictures of buses, trams and trains, particularly of London
buses, which are predominately red. Initially, I found that the red was being scanned as a bit
orange. Reflecta suggested trying ROC and it has helped significantly.
Without ROC
With ROC 50
A bus is a solid block of colour, so the effects of colour variations are more noticeable. JS reports
that, depending on the film type, using a ROC value of 25 improves the colours, and that a value of
50 sometimes works wonders. I can confirm this, and am now using ROC 25 as a standard setting
for all my scans. In the test I did, the results of using 25 and 50 were fairly similar.
ICE can be defined as either On or Off. If ICE is on, it will be applied to all scans.
GEM and ROC have an associated value on a scale from 0 – 100. The values defined in the
Preference Tab can be thought of as “scanner” values, and will be applied to all scans by default. If
slides are pre-scanned, it is possible to define a “slide” value for GEM and ROC which will be
applied to individually selected pre-scanned slides, and which override the “scanner” values
defined here. See section 6.3.6 for further information.
Cyberview
Page 16 of 33
Dec 2008
