调用Camera照相，图片太大的问题

我自己写的一个调用Camera来照相的程序，照出来的照片有3M多，处理时间太长，画面要卡很久，用系统的照相机照出来大概只有300多K，就不会卡很久，请问怎么去设置呢我现在的代码是camera = Camera.open();
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewFrameRate(5);
parameters.setPictureFormat(PixelFormat.JPEG);
parameters.set("jpeg-quality", 85);
parameters.setPictureSize(picWidth, picHeight);
camera.setParameters(parameters);
camera.setPreviewDisplay(mSurfaceHolder);
camera.startPreview();
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
 String path = Environment.getExternalStorageDirectory().getAbsolutePath()+ "/MyCamera/img/";
                                   
                         String fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())+ ".jpg";
                         File out = new File(path);
                         if (!out.exists()) 
                         {
                          out.mkdirs();
                         }
                         out = new File(path, fileName);
                         try 
                         {
                          FileOutputStream outStream = new FileOutputStream( out);
                          bitmap.compress(CompressFormat.JPEG, 100,outStream);
                             outStream.close();
                             camera.startPreview();
                         } 
                         catch (Exception e)
                         {
                          e.printStackTrace();
                         }图片