[jitter] Re: Numerical display of data in matrix...

The jit.unpack sends out a matrix name, not the values. 
Hence the jit.iter, which splits up the cell location and its corresponding values. 
Also, your 4 plane char is structured as argb so the first outlet of the unpack will give you 0 over all its cells as this is the alpha channel. 

#P button 123 275 15 0;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P newex 140 296 74 196617 pack set 0 0 0;
#P newex 155 269 58 196617 unpack 0 0;
#P newex 140 247 41 196617 jit.iter;
#P newex 140 224 66 196617 jit.unpack 4;
#P user jit.cellblock 253 315 427 438 3 9 16 16 20 20 0 1 1 0 0 0 1 0 5 0 0 0 255 255 255 231 231 231 0 0 0 191 191 191 0 0 0 215 215 240 1 1 1 2 4 0 0 0;
#P user jit.fpsgui 73 450 60 196617 0;
#P hidden message 193 21 69 196617 saturation \$1;
#P user uslider 278 36 13 43 256 1 0 0;
#P newex 242 103 87 196617 unpack 0 0 0;
#P user swatch 294 36 179 59;
#P button 166 142 15 0;
#P number 318 126 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P number 280 126 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P number 242 126 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P number 204 126 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P newex 166 160 164 196617 pack setall 0 0 0 0;
#P button 38 80 15 0;
#P user jit.pwindow 72 319 162 122 0 1 0 0 1 0;
#P flonum 107 59 35 9 0.5 0 1 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P toggle 73 59 15 0;
#P newex 73 79 59 196617 metro 10;
#P newex 73 195 123 196617 jit.matrix 4 char 16 16;
#P comment 218 196 136 196617 fill an entire matrix;
#P window setfont "Sans Serif" 18.;
#P comment 218 465 105 196626 Fill a Matrix;
#P connect 21 0 24 0;
#P fasten 21 0 23 3 145 292 208 292;
#P connect 20 0 21 0;
#P connect 23 0 19 0;
#P connect 24 0 23 0;
#P connect 2 0 6 0;
#P fasten 2 0 20 0 78 216 145 216;
#P fasten 22 1 23 2 208 290 187 290;
#P fasten 22 0 23 1 160 290 166 290;
#P connect 21 1 22 0;
#P connect 6 0 18 0;
#P connect 13 0 8 0;
#P hidden connect 16 0 17 0;
#P connect 9 0 8 1;
#P fasten 14 0 15 0 299 99 247 99;
#P connect 15 0 10 0;
#P fasten 15 0 13 0 247 122 171 122;
#P connect 10 0 8 2;
#P connect 15 1 11 0;
#P connect 11 0 8 3;
#P hidden connect 17 0 14 0;
#P connect 15 2 12 0;
#P connect 12 0 8 4;
#P connect 5 0 3 1;
#P connect 4 0 3 0;
#P fasten 3 0 2 0 78 111 78 111;
#P fasten 8 0 2 0 171 186 78 186;
#P fasten 7 0 2 0 43 106 78 106;
#P window clipboard copycount 25;