OAIS Rationale vs noise

Section 1.3 of OAIS, the Rationale section, versus random noise.
public.ccsds.o...
ffmpeg -f lavfi -i color=c=black:s=720x486 -vf drawtext="fontsize=32:fontfile=/Library/Fonts/Courier New.ttf:textfile=oais_rationale.txt:y=h-20*t:fontcolor=white,geq=if(gt(lum(X\,Y)\,16)\,1-(255*(N/100)*random(6))\,255*(N/1000)*random(1)):cb=128:cr=128" -t 45 -c:v ffv1 noisy_rationale.mkv