The image filter
sensitivity setting is global for the entire system and allows you to control
just how sensitive you wish the Active Image Control (AIC) to be.
This works in
conjunction with the High/Low sensitivity settings configurable on a per policy
basis.
In order to explain
it, a brief description of the algorithm will be given.
When an image is
scanned, the AIC module returns a value.
With the policy setting set to “High”, any value above 300 is deemed
pornographic. With the policy setting set
to “Low” any value above 600 is deemed pornographic.
With the new
sensitivity control, the percentage values determine just how sensitive the AIC
is in reacting to these values; the higher the value the more sensitive the
filter. The default setting is 70%. Note that when you modify the settings, the
Proxy will be re-started, causing a brief outage in throughput for your users.
Figure 8.13 shows
the screen.
Figure 8.13 – Setting the Image Filter sensitivity
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