Resizing grids in imagery without running another "Export Image"?

I have a set of jp2 imagery that consists of 256 jp2 grids. Is there a way in Global mapper to convert this set into a fewer number of grids (e.g., having 100 jp2 files instead of 256) without having to go through a time-extensive "Export Raster/Image Format" command? I am currently using v12.2, the 64 bit version. Thanks!
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THANKS<
MIKE
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