deleted 0..115, then: a.out: Renaming out-00116.rgb to out-00000.rgb... ... a.out: Renaming out-00588.rgb to out-00472.rgb... rm_oddframes.pl renumbered again have 0..236 first start with cementing 67 to 120, but since 111 is bad, and 113 is poor, better to do 67 to 110, also those beyond 110 just start getting brighter again Consider the sequence of 44 frames going from frame 67 to frame 110, of which there are 43 pairwise comparagrams, or, 43!/(2!*41!)=903 possible pairs: gamma(43+1)/(gamma(2+1)*gamma(41+1)) ans = 903.0000 Thus to do all pairwise possibilities there are 903 of them, then unroll the ones that are relatively certain, and register and combine the ones that are relatively certain.