Canon EOS REBEL XS Instruction Manual page 62

Custom Function Settings*
c,Fn H: image
0: Off
1 : Auto
For 1 sec. or longer exposures, noise reduction is performed
automatically if noise typical of _ong exposures is detected. This [Auto]
setting is effective in most cases.
2: On
Noise reduction is performed for all exposures 1 sec. or longer. The [On]
setting may be effective for noise that cannot be detected or reduced
with the [Auto) setting.
@ _ After the pictuie is taker,, ihe noise reduciien p_0cess may take the same
amQunt of time as the exposure. You cannot take another picture until
the neise [eduction process is comp!eted,
_, With setting 2, if a long exposure iS made during Live View shooting, the
LCD monitor wi!l not display anything {no Live View image display) whil e
noise reduction is applied,
0: Off
1: On
Reduces the noise generated in the image. Although noise reduction is
applied at all [SO speeds, it is particularly effective at high [SO speeds.
At low ISO speeds, the noise in the shadow areas is further reduce&
@ With setting 1! COntinuous shooting and White balance bracketing cannot
used.
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