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data:
# create image:
convert -font Arial -pointsize 24 label:Y +trim +repage -negate -bordercolor black -border 10 mask.gif
# create binary edge
convert mask.gif -edge 1 -threshold 0 mask_edge.gif
# list coordinates of only white edge pixels
convert mask_edge.gif txt:- > txt
sed -n 's/^\(.*\):.*white$$/\1/p' txt
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