PNGEncoder lose transparent quality

i've got problem transparent using pngencoder class. when encode bitmapdata png , use source of image, looks terrible. attach example. there 2 images - first colorful , above him white alpha gradient.

 

 

 

i've used other libraries aspngencoder, didn't help. it's code use:

 

 

           

var bd:bitmapdata = new bitmapdata(container.width, container.height, true, 0xffffff); bd.draw(container); var pngenc:pngencoder = new pngencoder();   var pngbytearray:bytearray = pngenc.encode(bd);   container.source = pngbytearray; var fl:file = file.applicationstoragedirectory.resolvepath("./images/file.png");   var fs:filestream = new filestream(); fs.open(fl, filemode.write); fs.writebytes(pngbytearray); fs.close(); 

 

i've tried new air 3.3 feature:

 

var pngbytearray:bytearray = new bytearray(); bd.encode(new rectangle(0,0,bd.width,bd.height), new flash.display.pngencoderoptions(), pngbytearray); 

 

but doesn't help. when save same image 3-4 times looks terrible.

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