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How to export canvas as png at 300 dpi

Posted on 2008-11-02
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Last Modified: 2013-11-11
I'm creating a Card design application in Flex 3 with php on the server side. I'm running into issues with exporting canvas to png at 300 dpi. So far image is only coming out as 72 dpi. Any idea how to make image output 300dpi. Here's how I currently capture the canvas before sending to php to save image:
drawingBoard.clipContent = false;
	Application.application.clipContent = false;
	
         var base64string:String = ImageSnapshot.encodeImageAsBase64( ImageSnapshot.captureImage(drawingBoard,300, new PNGEncoder(),false) );

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Question by:skywalker98
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Expert Comment

by:trypt
ID: 22866596
i don't think u can capture the screen with more than 72 dpi unless ur screen's resolution is more than 72 dpi... but i think u can try this work around... multiply the size of the screen capture image by 417%, then u should get the dimension of the image at 300dpi when printed out...
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Gary Benade earned 500 total points
ID: 22902339

<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="300" creationComplete="init()">
<mx:Script>
	<![CDATA[
		private function init():void
		{
			drawArea.graphics.drawCircle(100,100,100);
			var b:BitmapData = new BitmapData(1000,1000,false,0xFFFFFF);
			var m:Matrix = new Matrix();
			m.scale(300.0/72.0);
			b.draw( drawArea, m);
			var bmp:Bitmap = new Bitmap( b, "auto", true); 
			// bmp will now contain a 300dpi version of drawArea
			// save data here
			b.dispose(); // clean up
		}
	]]>
</mx:Script>
	<mx:HBox id="drawArea" x="24" y="22" width="352" height="211">
	</mx:HBox>
</mx:Canvas>

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