Canon EOS 60D - Manual (Page 254)

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3 Custom Function SettingsN
C.Fn II: Image
C.Fn II -1 Long exposure noise reduction
0: Off
1: Auto
For 1 sec. or longer exposures, noise reduction is performed
automatically if noise typical of long exposures is detected. This [Auto]
setting is effective in most cases.
2: On
Noise reduction is performed for all exposures of 1 sec. or longer. The
[On] setting may be able to reduce noise which otherwise cannot be
detected with the [Auto] setting.
C.Fn II -2 High ISO speed noise reduction
Reduces the noise generated in the image. Although noise reduction is
applied at all ISO speeds, it is particularly effective at high ISO speeds. At
low ISO speeds, the noise in the shadow areas is further reduced. Change
the setting to suit the noise level.
0: Standard
2: Strong
1: Low 3: Disable
With settings 1 and 2, after the picture is taken, the noise reduction
process may take the same amount of time as the exposure. You cannot
take another picture until the noise reduction process is completed.
At ISO 1600 and higher, noise might be more pronounced with setting 2
than with setting 0 or 1.
With setting 2, if a long exposure is shot with the Live View displayed,
“BUSY” will be displayed during the noise reduction process. The Live
View display will not appear until the noise reduction is completed. (You
cannot take another picture.)
With setting 2, the maximum burst for continuous shooting will greatly
decrease.
If you playback a RAW or RAW+JPEG image with the camera or print an
image directly, the effect of the high ISO speed noise reduction may look
minimal. You can check the noise reduction effect or print noise-reduced
images with Digital Photo Professional (provided software).