Canon EOS REBEL T2I Instruction Manual page 76

Appending Dust Delete Data*
Normally, the Self Cleaning Sensor Unit will eliminate most of the dust
that might be visible on captured images. However, in case visible dust
still remains, you can append the Dust Delete Data to the image for
erasing the dust spots later. The Dust Delete Data is used by Digital
Photo Professional (provided software) to erase the dust spots
automatically.
Rreparation
® Get a solid=white object (paper, etc.).
® Set the lens focal length to 50mm or longer.
® Set the lens focus mode switch to <MF> and set the focus to infinity
(oo). If the lens has no distance scale, look at the front of the lens
and turn the focusing ring clockwise all the way.
Obtain the Dust DeJete Data
Semect [Dust Delete Data].
® Under the [t_] tab, select [Dust
DeJete Data], then press <_>.
2
Semect [OK].
® Select [OK] and press <_>. After
the automatic self=cleaning of the
sensor is performed, a message will
appear. Although there will be a
shutter sound, a picture is not taken.
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