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You may use our RawDigger application to inspect RAW image sub-frames.

We do not plan to support frame selection in multi-frame files in FastRawViewer: it may be VERY memory consuming because RAW file can contain dozens sub-frames, many megabytes each (for example, Canon 'RAW burst' files). Combined with FastRawViewer's  RAW data pre-fetch/pre-decode this may result in a multi-gigabyte memory footprint if several/many multi-frame files are present in the folder being culled.



Alex Tutubalin/FastRawViewer team