Canon EOS RP Instruction Manual page 383

When shooting HDR images with [Auto Image Align] set to [Enable], AF
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point display information ( = 352) and Dust Delete Data ( = 161) will not be
appended to the image.
If you perform handheld HDR shooting with [Auto Image Align] set to
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[Enable], image periphery will be slightly trimmed and resolution will be slightly
lowered. Also, if the images cannot be aligned properly due to camera shake,
etc., auto image alignment may not take effect. Note that when shooting with
excessively bright (or dark) exposure settings, auto image alignment may not
work properly.
If you perform handheld HDR shooting with [Auto Image Align] set to
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[Disable], the three images may not be properly aligned and the HDR effect
may be reduced. Using a tripod is recommended.
Auto image alignment may not function properly with repetitive patterns (lattice,
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stripes, etc.) or flat, single-tone images.
The color gradation of the sky or white walls may not be reproduced correctly.
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Irregular colors, irregular exposure or noise may appear.
HDR shooting under fluorescent or LED lighting may result in unnatural color
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reproduction of the illuminated areas.
With HDR shooting, the images will be merged, then saved to the card,
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so it may take some time. [BUSY] appears on the screen as images are
processed, and shooting is not possible until processing is finished.
HDR (High Dynamic Range) Shooting
175