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                <img src="" alt="" width="200" height="200" id="img">
<div id="drawing"></div>




                // #imgの要素を取得
var img = document.getElementById('img');

// #imgの画像の情報を取得
var imgSrc = img.getAttribute('src');
var imgW = img.getAttribute('width');
var imgH = img.getAttribute('height');

// 画像と同じ幅/高さのsvg要素を用意
var draw = SVG('drawing').size(imgW, imgH);

// image()に画像のパスを渡してsvg要素内にimage要素として生成
var image = draw.image(imgSrc);

// mask要素を生成し、マスキングしたい形を追加していく(ちなみに塗りの色が白から離れるほど透過度が下がっていく)
var mask = draw.mask();
var circle =, 50).fill('#fff'); // 左上の円
mask.add(circle.clone().center(150, 50).fill('#ccc')); // 右上の円
mask.add(circle.clone().center(50, 150).fill('#999')); // 左下の円
mask.add(circle.clone().center(150, 150).fill('#666')); // 右下の円

// maskWith()にmaskを渡す

// 元の#imgを非表示に = 'none';