Canon EOS RP Advanced User's Manual page 124

Correction of Lens Aberrations due to Optical Characteristics
Peripheral Illumination Correction
Vignetting (dark image corners) can be corrected.
Depending on shooting conditions, noise may appear on the image periphery.
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The higher the ISO speed, the lower the correction amount will be.
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The correction amount applied will be lower than the maximum correction
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amount that applied with Digital Photo Professional (EOS software).
Peripheral illumination is corrected automatically in Basic Zone modes when
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correction data is registered on the camera.
Distortion Correction
Distortion (image warping) can be corrected.
To correct distortion, the camera captures a narrower image area than the
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area seen when shooting, which crops the image a little and slightly lowers the
apparent resolution.
Setting distortion correction may change the angle of view slightly.
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The amount of image cropped may vary between still photos and movies.
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When you magnify images, distortion correction is not applied to the images
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displayed.
Images with distortion correction applied will not have the Dust Delete Data
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( = 161) appended.
For details on lenses you can use to record movies with distortion correction,
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visit the Canon website.
Distortion is corrected automatically when < 8 > mode is set to < q > and
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correction data is registered on the camera.
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