Samsung SNP-1000A - Manual (Page 81)

5.2. PTZ Camera User Menu Settings
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5.2.6. AGC
When the brightness of the image taken under dark light is under a
certain level, the AGC (Automatic Gain Control) functions to define
whether to control the Gain automatically or not.
ƒ HIGH : Gain increased from 6dB up to 34dB.
ƒ NORMAL : Gain increased from 6dB up to 18dB.
ƒ OFF : Gain is fixed at 6dB.
5.2.7. SSNR (Samsung Super Noise Reduction)
SSNR function reduces background noise under low light conditions
differently in different modes. The noise reduction effect grows in
Off, Low, Middle and High modes in order.
ƒ OFF : No noise reduction effect.
ƒ LOW : Noise reduction effect is small but there is little afterimage.
ƒ MIDDLE: Noise reduction effect is generally effective in this mode.
Noise can be reduced properly and the afterimage is not strong.