[Mapit] Using png

[Bernhard Reiter]

Ever woundered about the jpeg artifacts in the rendered maps?

Images in Jpeg format can be created pretty fast, 
but png will feature lossless compression.

If you switch on png support in mapconfig.py, you should 
apply the attached patch (against mapit-1.0) if you want
indexed images. 

This will reduce the size of the created images considerably. 
Check 	www.mapit.de/mapit/herne.de/
and compare it to other example servers still delivering pngs. :)

	Bernhard
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# make sure the image is indexed before delivery
--- makemap.py.org	Tue Jan 15 18:27:01 2002
+++ makemap.py	Tue Jan 15 18:29:07 2002
@@ -150,6 +150,10 @@
 		(1,parameters.height - 1 - s_height), source_image)
         source_image = None
 
+    # make it indexed
+    image = image.convert(mode = 'P', palette = PIL.Image.ADAPTIVE,
+                                      dither = PIL.Image.NONE)
+
     return image

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