convert -debug annotate xc: -font Arial -pointsize 40 \
-annotate 0 'g' null: 2>&1 |\
grep Metrics: | fmt -w80
Metrics: text: g; width: 20; height: 46; ascent: 37; descent: -9;
max advance: 80; bounds: 2,-8 20,21; origin: 22,0; pixels per em: 40,40;
underline position: -3.39063; underline thickness: 2.34375
The origin of 22,0 does not seem to correlate with Anthony's IM image of `g' or using IM to draw a `g'.