Canon EOS 90D Advanced User's Manual page 242

Appending Dust Delete Data
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 unaff ected by Dust Delete Data appended to images.
If the object has any pattern or design, it may be recognized as dust data and
o
aff ect the accuracy of the dust deletion with the Digital Photo Professional (EOS
software).
242
3
Shoot a plain white object.
Shoot with a plain white object (such

as a new sheet of white paper) fi lling
the screen, at a distance of 20–30 cm
(0.7–1.0 ft.).
Since the image will not be saved, the

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,

an error message will appear. Follow
the "Preparation" procedure on the
preceding page, then select [OK]. Take
the picture again.