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ちなみに Convex hull はこういうの
% convert logo: logo.jpg
% ch=` identify -verbose logo: | awk -F : '/Convex/ {print $2}' `
% convert logo: -draw "polyline $ch" logo_ch.jpg
Joining @/tabia.jpg 's #dtiys on ig
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#artidn #ArtistOfIndonesia #teatiintIllust #drawthisinyourstyle #zonakaryaid