我想改圖
將個圖變哂黑色
example
http://hk.image.search.yahoo.com/images/view;_ylt=A8tUwJlmVGxQj3IA1h21ygt.;_ylu=X3oDMTBlMTQ4cGxyBHNlYwNzcgRzbGsDaW1n?back=http%3A%2F%2Fhk.image.search.yahoo.com%2Fsearch%2Fimages%3Fp%3D%25E5%25B7%25A5%25E4%25BA%25BA%26ei%3DUTF-8%26meta%3Drst%253Dhk%26fr%3DFP-tab-img-t5.0%2B%2528Windows%2BNT%2B6.1%2529%2BAppleWebKit%252F537.1%2B%2528KHTML%252C%2Blike%2BGecko%2529%2BChrome%252F21.0.1180.83%2BSafari%252F537.1%26tab%3Dorganic%26ri%3D71&w=1200&h=1200&imgurl=us.123rf.com%2F400wm%2F400%2F400%2Fgbradic%2Fgbradic0907%2Fgbradic090700006%2F5338223-worker-silhouette-vector.jpg&rurl=http%3A%2F%2Fgb.123rf.com%2Fphoto_5338223_worker-silhouette-vector.html&size=113.9+KB&name=%E5%B7%A5%E4%BA%BA%E5%89%AA%E5%BD%B1%E7%9F%A2%E9%87%8F+%E5%85%8D%E7%89%88%E7%A8%8E%E5%89%AA%E8%B4%B4%E7%94%BB%EF%BC%8C%E5%90%91%E9%87%8F%E6%8F%92%E5%9B%BE%E5%92%8C%E8%82%A1%E7%A5%A8.+Image+...&p=%E5%B7%A5%E4%BA%BA&oid=d37add6c4f343f1ed86f4396996cdb27&fr2=&fr=FP-tab-img-t5.0+%28Windows+NT+6.1%29+AppleWebKit%2F537.1+%28KHTML%2C+like+Gecko%29+Chrome%2F21.0.1180.83+Safari%2F537.1&tt=%25E5%25B7%25A5%25E4%25BA%25BA%25E5%2589%25AA%25E5%25BD%25B1%25E7%259F%25A2%25E9%2587%258F%2B%25E5%2585%258D%25E7%2589%2588%25E7%25A8%258E%25E5%2589%25AA%25E8%25B4%25B4%25E7%2594%25BB%25EF%25BC%258C%25E5%2590%2591%25E9%2587%258F%25E6%258F%2592%25E5%259B%25BE%25E5%2592%258C%25E8%2582%25A1%25E7%25A5%25A8.%2BImage%2B...&b=61&ni=72&no=71&ts=&tab=organic&sigr=11vq89b8o&sigb=177mquriu&sigi=134ivfdmr&.crumb=SwsZWNpWShl
點做的?