Canon EOS M6 Mark II Advanced User's Manual page 177

Dust Delete Data Appending
The camera will append the Dust Delete Data obtained to all shots from
now on. Acquiring Dust Delete Data before shooting is recommended.
For details about using Digital Photo Professional (EOS software) to erase
dust spots automatically, refer to the Digital Photo Professional Instruction
Manual.
File size is essentially unaffected by Dust Delete Data appended to images.
If the object has any pattern or design, it may be recognized as dust data and
z
affect the accuracy of the dust deletion with the Digital Photo Professional (EOS
software).
With [RAW burst mode], Dust Delete Data is not appended.
z
3
Shoot a plain white object.
Shoot with a plain white object (such
z
as a new sheet of white paper) filling
the screen, at a distance of 20–30 cm
(0.7–1.0 ft.).
Since the image will not be saved, the
z
data can still be obtained even if there is
no card in the camera.
When the picture is taken, the camera
will start collecting the Dust Delete Data.
When the Dust Delete Data is obtained,
a message will appear.
If the data is not obtained successfully,
z
an error message will appear.
After reviewing the information in
"Preparation" ( = 176), select [OK],
then shoot again.
Dust Delete Data Acquisition
177