import com.adobe.images.JPGEncoder;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.net.URLRequestHeader;
import flash.net.navigateToURL;
import flash.utils.ByteArray;

//画位图数据
var jpgSource:BitmapData = new BitmapData (picture.width, picture.height);
jpgSource.draw(picture);
//生成编码容器
var jpgEncoder:JPGEncoder = new JPGEncoder(95);
//将位图数据编码到容器内成为ByteArray流
var jpgStream:ByteArray = jpgEncoder.encode(jpgSource);
//压缩ByteArray流
jpgStream.compress();
//添加stream的header请求
var header:URLRequestHeader = new URLRequestHeader("Content-type", "application/octet-stream");
var jpgURLRequest:URLRequest = new URLRequest("save.php");
jpgURLRequest.requestHeaders.push(header);
jpgURLRequest.method = "POST";
jpgURLRequest.data = jpgStream;
//推送图片数据到服务器端
navigateToURL(jpgURLRequest, "_blank");

<?php
$jpg = gzuncompress($GLOBALS["HTTP_RAW_POST_DATA"]);
header("Content-Type: image/jpeg");
echo $jpg;
?>