sixel.k

/sixel output (k9)
/image data is rgb in int32

six:{cmap:{{"#",($*x),";2;",";"/:$|1_x}'+(,!#x),+(255/100*-3$256\:)'x}
  u:?,/x;d:"-"/:,/'{"#",($x),"!6~"}''u?x
  (0x1b,"Pq",,/cmap u),d,0x1b,"\\"}

/ e.g.
animal:+ 459001 8973467 11660987 989550 1382680 4875085 9738128 15922674@32^,/(-8$8\:)'0 82 4793490 4793417 0 117074 4793490 4756041 0 8126442 4793490 2396745 0 14680050 4793489 2396745 4 16744445 4793481 2396745 6 15879677 4793489 3595117 31 15879605 11084945 2551230 6 16449535 16065681 2555814 30 16515071 16426130 2547191 253 16252351 16688274 2416564 383 12056871 16688274 2416126 446 14121255 16688274 2416638 484 10419511 16688274 4496319 420 9895927 16327826 4496382 316 14670268 16065682 4494198 54 16769023 8987794 4756351 29 16412671 11084946 4756342 6 15888383 13182098 4756055 6 16743223 13182098 4756078 6 16771375 13182098 4788847 6 15880127 8987794 4788813 5 13786036 4793490 4788813 3 13791229 4793490 4788813 0 10485729 2696338 4788813 0 977641 2696338 4792905 0 25 2696338 11084361 0 5 2434194 11084361 0 3 2434194 11084361 0 0 10790034 13182025 0 0 7640210 4793417 0 0 1348754 13182025 0 0 184978 4793417

""0:six animal