nitf2jpeg converts NITF imagery to JPEG imagery.  Originally, this code was written to rewrite r0 files of the Greene 07 data set:    https://www.sdms.afrl.af.mil/index.php?collection=greene07  The block indices found on the DVDs are corrupted and are recalculated with the following code.    This code is capable to converting all r-sets to JPEG format on the Greene 07 data set.  It is untested for other nitf files but should work fine, as it just does search/fix for indexing errors.  Compile:  	 cmake . 	 make	   Usage: 	 nitf2jpeg <filename_in.pgm.r0> <filename_out.jpg OPTIONAL>