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画像ファイルの容量を小さくする(サイズ縮小/グレースケール化)

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resize.sh
# jpgファイルを縦幅1024pxに縮小して上書き保存
mogrify -resize x1024 -unsharp 2x1.4+0.5+0 -verbose *.jpg

# pngファイルを横幅1024pxに縮小して上書き保存
mogrify -resize 1024x -unsharp 2x1.4+0.5+0 -verbose *.png

# pngファイルを80%に縮小して上書き保存
mogrify -resize 80% -unsharp 2x1.4+0.5+0 -verbose *.png
grayscale.sh
# pngファイルをグレースケールへ変換して上書き保存
mogrify -colorspace grayscale -verbose *.png
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