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ImageMagickリサイズ

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ImageMagickでリサイズの組み合わせ

  • 縦横比を維持せず、指定されたサイズに伸縮
    convert -scale WxH! inputfile outputfile

  • 縦横比を維持して、両側をクロップ
    convert -resize WxH^ -gravity center -crop WxH+0+0 [+repage] inputfile outputfile

  • 縦横比を維持して、両側の余白部分は塗り潰す
    convert -resize WxH -gravity center -background red -extent WxH inputfile outputfile

WとHは、それぞれリサイズする幅と縦のサイズ。
塗りつぶしは、赤で指定。

参考

ImageMagick: Command-line Options

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