--- pdf.py	2011-09-08 19:48:40.000000000 -0700
+++ pdf1.py	2011-09-08 19:50:26.000000000 -0700
@@ -11,7 +11,7 @@
 # Run ./jbig2 -s -p <other options> image1.jpeg image1.jpeg ...
 # python pdf.py output > out.pdf
 
-dpi = 600
+#dpi = 600
 
 class Ref:
   def __init__(self, x):
@@ -121,16 +121,16 @@
     except IOError:
       sys.stderr.write("error reading page file %s\n"% p)
       continue
-    (width, height) = struct.unpack('>II', contents[11:19])
+    (width, height,xres,yres) = struct.unpack('>IIII', contents[11:27])
     xobj = Obj({'Type': '/XObject', 'Subtype': '/Image', 'Width':
         str(width), 'Height': str(height), 'ColorSpace': '/DeviceGray',
         'BitsPerComponent': '1', 'Filter': '/JBIG2Decode', 'DecodeParms':
         ' << /JBIG2Globals %d 0 R >>' % symd.id}, contents)
-    contents = Obj({}, 'q %f 0 0 %f 0 0 cm /Im1 Do Q' % (float(width * 72) / dpi, float(height * 72) / dpi))
+    contents = Obj({}, 'q %f 0 0 %f 0 0 cm /Im1 Do Q' % (float(width * 72) / xres, float(height * 72) / yres))
     resources = Obj({'ProcSet': '[/PDF /ImageB]',
         'XObject': '<< /Im1 %d 0 R >>' % xobj.id})
     page = Obj({'Type': '/Page', 'Parent': '3 0 R',
-        'MediaBox': '[ 0 0 %f %f ]' % (float(width * 72) / dpi, float(height * 72) / dpi),
+        'MediaBox': '[ 0 0 %f %f ]' % (float(width * 72) / xres, float(height * 72) / yres),
         'Contents': ref(contents.id),
         'Resources': ref(resources.id)})
     [doc.add_object(x) for x in [xobj, contents, resources, page]]