ImageMagick Round a Image - Mask
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| mkdir -p thumbs | |
| for f in *.jpg; do | |
| size=$(identify -format "%[fx:w]" $f) | |
| sizeh=$(expr $size / 2) | |
| convert -size "$size"x"$size" xc:none -fill $f -draw "fill white circle $sizeh,$sizeh $sizeh,1" thumbs/$f.png | |
| ; done |
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