How to disable margin top when printing an image?

Hi i am using an iMZ 320 to print an image, i manage to connect with my app and print an image, but i am having a default margin top that i dont know how to delete it. Anyone can share some command or configuration? Pleaaaseeeeeeeeee.

 

Here is the code i am using

 

     var view = this.Window.DecorView;

     view.DrawingCacheEnabled = true;

     Bitmap bitmap = view.GetDrawingCache(true);

     Bitmap resizeBitMap = Bitmap.CreateScaledBitmap(bitmap, 896, 672, true);

 

     // ZPL Commands

     string setLanguageCommand = "\r\n! U1 setvar \"device.languages\" \"zpl\"\r\n";

     string printerCommand = "^XA^FO0,0^XGR:IMAGE.GRF^XZ";

     string labelLenghtCommand = "\r\n! U1 setvar \"zpl.label_length\" \"1000\"\r\n";

 

     // Send command to printer to configure it

     byte[] responseSetLenguage = printer.Connection.SendAndWaitForResponse(Encoding.ASCII.GetBytes(setLanguageCommand), 500, 500);

     byte[] responseLabelLenghtCommand = printer.Connection.SendAndWaitForResponse(Encoding.ASCII.GetBytes(labelLenghtCommand), 500, 500);

 

     // Store image to print

     printer.StoreImage("R:IMAGE.GRF", resizeBitMap, 580, 1000);

 

     // Print image stored with ZPL Command

     byte[] responsePrinterCommand = printer.Connection.SendAndWaitForResponse(Encoding.ASCII.GetBytes(printerCommand), 500, 500);

 

     // Response of printer

     string response1string = Encoding.ASCII.GetString(responseSetLenguage);

     string response2string = Encoding.ASCII.GetString(responsePrinterCommand);

 

And here is the image of the problem

 

Archivo 7-3-17 12 38 50 PM.jpeg