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ImageMagickで画像を上書きする

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convertコマンドの代わりにmogrifyコマンドを使えばよい。

$ convert -resize 200% original.bmp converted.bmp

$ mogrify -resize 200% original.bmp

convertコマンドで動作結果を確認した後で $ mogrify -resize 200% *.bmpとすると楽ちん。

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