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    <p>A long time ago I was looking for the same thing and I tried using loops to check for each pixel. But that took <strong>a lot</strong> of time and consumed incredible amount of CPU. Luckily we have the <a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/BitmapData.html#compare%28%29" rel="nofollow"><code>BitmapData.compare()</code></a> method, which outputs a Bitmapdata if there are any diferences in compared BitmapData objects.</p> <p>Also there's the <a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/BitmapData.html#transparent" rel="nofollow"><code>BitmapData.transparent</code></a> property, which actually directly gives you the answer as a Boolean. But I have never used it directly on a loaded image myself.</p> <pre><code>import flash.display.Loader; import flash.net.URLRequest; import flash.events.Event; import flash.display.Bitmap; import flash.display.BitmapData; import flash.geom.Point; var ldr:Loader = new Loader(); var req:URLRequest = new URLRequest('someImage.png'); ldr.contentLoaderInfo.addEventListener(Event.COMPLETE,imgLoaded); ldr.load(req); function imgLoaded(e:Event):void { var l:Loader = e.target.loader, bmp:Bitmap = l.content as Bitmap, file:String = l.contentLoaderInfo.url.match(/[^\/\\]+$/)[0]; trace(bmp.bitmapData.transparent); // I think this default property should do it but // in case it does not, here's another approach: var trans:Boolean = isTransparent(bmp.bitmapData); trace(file,'is'+(trans ? '' : ' not'),'transparent'); } function isTransparent(bmpD:BitmapData):Boolean { var dummy:BitmapData = new BitmapData(bmpD.width,bmpD.height,false,0xFF6600); // create a BitmapData with the size of the source BitmapData // painted in a color (I picked orange) dummy.copyPixels(bmpD,dummy.rect,new Point()); // copy pixels of the original image onto this orange BitmapData var diffBmpD:BitmapData = bmpD.compare(dummy) as BitmapData; // this will return null if both BitmapData objects are identical // or a BitmapData otherwise return diffBmpD != null; } </code></pre>
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    1. POCheck if a PNG image contains (semi) transparent pixel using AS3
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    1. COThank you for the answer. Both of your methods work great on my test!
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      1. USHoang Huynh
    2. COThis is... elegant. I like it. How is the speed compared to the pixel-by-pixel approach I posted?
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      1. USJosh Janusch
    3. CO@inhan `BitmapData.transparent` is the fastest solution so far but sometimes it fails to detect opaque images saved from Photoshop, like [this one](http://ge.tt/api/1/files/7NBwYNS/0/blob?download)
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