diff --git a/escpos/escpos.py b/escpos/escpos.py
index 2263458..045a4fd 100644
--- a/escpos/escpos.py
+++ b/escpos/escpos.py
@@ -41,7 +41,7 @@ class Escpos:
         buffer = ""
        
         self._raw(S_RASTER_N)
-        buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1], 0)
+        buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1]&0xff, size[1]>>8)
         self._raw(buffer.decode('hex'))
         buffer = ""
 
@@ -68,7 +68,7 @@ class Escpos:
 
         if im.size[0] > 512:
             print  ("WARNING: Image is wider than 512 and could be truncated at print time ")
-        if im.size[1] > 255:
+        if im.size[1] > 0xffff:
             raise ImageSizeError()
 
         im_border = self._check_image_size(im.size[0])