Hey,

based on the meegotouch theme avatar-mask and avatar-frame icons:


convert /usr/share/themes/blanco/meegotouch/images/theme/basement/meegotouch-avatar/meegotouch-avatar-mask-large.png \( -resize 80x80 in.png \) -compose Minus -composite out.png

or with frame

convert /usr/share/themes/blanco/meegotouch/images/theme/basement/meegotouch-avatar/meegotouch-avatar-frame-large.png \( /usr/share/themes/blanco/meegotouch/images/theme/baseme
nt/meegotouch-avatar/meegotouch-avatar-mask-large.png \( -resize 80x80 in.png \) -compose Minus -composite \) -compose Plus -composite out2.png


where in.png is your input image file.

(left without frame, right with frame)