You can check if the image's color model includes an alpha channel:
BufferedImage img = ImageIO.read(/* from somewhere */);
if (img.getColorModel().hasAlpha()) {undefined
// img has alpha channel
} else {undefined
// no alpha channel
}
Note that This code only detects images that have been saved with alpha channel. Images with an alpha channel may still be fully opaque (i.e. alpha = 1 for all pixels).
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','/static/images/logo.png', '推荐 猫吃鱼 的问题《java 怎么判断png图片是否是有透明度的》','http://www.shouhuola.com/answer/37375/144573.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
解决方案
You can check if the image's color model includes an alpha channel:
BufferedImage img = ImageIO.read(/* from somewhere */);
if (img.getColorModel().hasAlpha()) {undefined
// img has alpha channel
} else {undefined
// no alpha channel
}
Note that This code only detects images that have been saved with alpha channel. Images with an alpha channel may still be fully opaque (i.e. alpha = 1 for all pixels).
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