python - <<'PY'
import tifffile,numpy as np,cv2
for s in ['HH-1041','HH-1206','HH-7150']:
 a=tifffile.imread('/workspace/input/photos/'+s+'.tif').astype('float32')/65535;b=tifffile.imread('/workspace/input/charts/'+s+'_chart.tif').astype('float32')/65535
 for xy in [(100,100),(1600,500),(700,500),(700,1100),(1100,400),(1800,1350)]:
  x,y=xy;aa=a[y:y+20,x:x+20].mean((0,1));bb=b[y:y+20,x:x+20].mean((0,1));print(s,xy,aa.round(4),bb.round(4),(aa-bb).round(4))
PY