A question: in the G’MIC plugin there is the filter Testing - Garagecoder - Warp Map. Can this filter be used from the DOS command line? If so, how are the input files specified? Copying out the parms from the plugin, there is no indication of how the input files are specified and I failed to find anything online.
Following is the command I used but which did not work:
gmic verbose + input thefile2.jpg input thefile.jpg +gcd_warpmap 5,0,0,0,0 cut 0,255 output warpmap0.jpg cut 0,255 out put warpmap1.jpg [gmic]-0./ Start G'MIC interpreter. [gmic]-0./ Increment verbosity level (set to 2). [gmic]-0./ Input file 'thefile2.jpg' at position 0 (1 image 1428x835x1x3). [gmic]-1./ Input file 'thefile.jpg' at position 1 (1 image 1428x835x1x3). [gmic]-2./gcd_warpmap/*repeat/*local/*if/ Set local variable 'bm=0'. [gmic]-3./ Cut image  in range [0,255]. [gmic]-3./ Output image  as jpg file 'warpmap0.jpg', with quality 100% (1 image 1428x835x1x3). [gmic]-3./ Cut image  in range [0,255]. [gmic]-3./ Output image  as jpg file 'warpmap1.jpg', with quality 100% (1 image 1428x835x1x3). [gmic]-3./ End G'MIC interpreter.