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Hi Erik
Need more info, sorry!
What sort of pictures are you combining (JPEG or RAW)?
How many exposures did you make (lots of shots, or one RAW file that you adjust)?
What ISO did you shoot at?
What camera have you used?
What was your shutter speed?
HDR doesn't usually increase noise but it may make it more obvious in certain areas depending on the ISO setting and contrast range.
DRI on the other hand makes noise much much worse as you magnify it by overlaying it.
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