HDR is an acronym for High Dynamic Range. It refers to a type of processing used to combine a series of images taken at different exposures and merged to create a higher dynamic range than you could get with a single images.
One example would be a sunset where you expose for the sky and ground separately, then combine the two images to show both parts well exposed. This merging can be done automatically with special software, or manually by masking out specific areas of each image.
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