DEfusion.org.uk JavaScript Image Cropper UI, using Prototype & script.aculo.us The JavaScript image cropper UI allows the user to crop an image using an interface with the same features and styling as found in commercial image editing software, and is is based on the Prototype JavaScript framework and script.aculo.us. prototype.jsベースの画像切抜き用JavaScriptライブラリ。 写真上でドラッグすると破線で枠が作成され、囲んだ領域の座標とサイズを取得できます。