diff --git a/grey.txt b/grey.txt
new file mode 100644
index 0000000..5f6e3b3
--- /dev/null
+++ b/grey.txt
@@ -0,0 +1,256 @@
+0,0,0,255
+1,1,1,255
+2,2,2,255
+3,3,3,255
+4,4,4,255
+5,5,5,255
+6,6,6,255
+7,7,7,255
+8,8,8,255
+9,9,9,255
+10,10,10,255
+11,11,11,255
+12,12,12,255
+13,13,13,255
+14,14,14,255
+15,15,15,255
+16,16,16,255
+17,17,17,255
+18,18,18,255
+19,19,19,255
+20,20,20,255
+21,21,21,255
+22,22,22,255
+23,23,23,255
+24,24,24,255
+25,25,25,255
+26,26,26,255
+27,27,27,255
+28,28,28,255
+29,29,29,255
+30,30,30,255
+31,31,31,255
+32,32,32,255
+33,33,33,255
+34,34,34,255
+35,35,35,255
+36,36,36,255
+37,37,37,255
+38,38,38,255
+39,39,39,255
+40,40,40,255
+41,41,41,255
+42,42,42,255
+43,43,43,255
+44,44,44,255
+45,45,45,255
+46,46,46,255
+47,47,47,255
+48,48,48,255
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+50,50,50,255
+51,51,51,255
+52,52,52,255
+53,53,53,255
+54,54,54,255
+55,55,55,255
+56,56,56,255
+57,57,57,255
+58,58,58,255
+59,59,59,255
+60,60,60,255
+61,61,61,255
+62,62,62,255
+63,63,63,255
+64,64,64,255
+65,65,65,255
+66,66,66,255
+67,67,67,255
+68,68,68,255
+69,69,69,255
+70,70,70,255
+71,71,71,255
+72,72,72,255
+73,73,73,255
+74,74,74,255
+75,75,75,255
+76,76,76,255
+77,77,77,255
+78,78,78,255
+79,79,79,255
+80,80,80,255
+81,81,81,255
+82,82,82,255
+83,83,83,255
+84,84,84,255
+85,85,85,255
+86,86,86,255
+87,87,87,255
+88,88,88,255
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+90,90,90,255
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+92,92,92,255
+93,93,93,255
+94,94,94,255
+95,95,95,255
+96,96,96,255
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+115,115,115,255
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+240,240,240,255
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+242,242,242,255
+243,243,243,255
+244,244,244,255
+245,245,245,255
+246,246,246,255
+247,247,247,255
+248,248,248,255
+249,249,249,255
+250,250,250,255
+251,251,251,255
+252,252,252,255
+253,253,253,255
+254,254,254,255
+255,255,255,255
\ No newline at end of file
diff --git a/osmbase.map b/osmbase.map
index f0df490..96929e6 100644
--- a/osmbase.map
+++ b/osmbase.map
@@ -42,7 +42,16 @@ PROJECTION
    "init=epsg:OSM_SRID"
 END
 
-
+OUTPUTFORMAT
+  NAME "png"
+  DRIVER AGG/PNG8
+  MIMETYPE "image/png;mode=8bit,grayscale"
+  IMAGEMODE RGB
+  EXTENSION "png"
+  TRANSPARENT FALSE
+  FORMATOPTION "PALETTE=grey.txt"
+  FORMATOPTION "PALETTE_FORCE=on"
+END
 
 #include LEVELPASTER(THEME,0)
 #include "land.map"