Canon EOS 5D Mark IV L-series Standard Zoom Lens Kit Owner's Manual

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This function reduces the noise generated in the image. Although noise 
reduction is applied at all ISO speeds, it is particularly effective at high 
ISO speeds. When shooting at low ISO speeds, the noise in the darker 
parts of the image (shadow areas) can further be reduced.
1
Select [High ISO speed NR].
 
Under the [z3] tab, select [High ISO 
speed NR
], then press <0>.
2
Set the level.
 
Select the desired noise reduction 
level, then press <0>.
 
M
: Multi Shot Noise Reduction
This applies noise reduction with higher image quality than [High]. 
For a single photo, four shots are taken continuously and aligned 
and merged automatically into a single JPEG image.
If the image-recording quality is set to RAW or RAW+JPEG, you 
cannot set [Multi Shot Noise Reduction].
3
Take the picture.
 
The image will be recorded with noise 
reduction applied.
3
 Setting Noise ReductionN
High ISO Speed Noise Reduction
You can set to display <z> in the viewfinder and on the LCD panel for 
when Multi Shot Noise Reduction is set (p.489).