What is the best format to save an image in Python, and why does pydot save invalid images?

Question

I am using pydot to save an image file on my machine and then use the Image module to open the file. However, I get an error using Windows Photo viewer

Answer 1

This looks like a known bug in the image viewer of PIL on Windows Vista/7. You can try to fix PIL/ImageShow.py as follows:

diff -r 142e08f1b589 PIL/ImageShow.py
--- a/PIL/ImageShow.py  Sun Aug 01 22:00:26 2010 +0200
+++ b/PIL/ImageShow.py  Wed Jan 05 10:46:47 2011 -0800
@@ -97,7 +97,7 @@
     class WindowsViewer(Viewer):
         format = "BMP"
         def get_command(self, file, **options):
-            return "start /wait %s && del /f %s" % (file, file)
+            return "start /wait %s && ping -n 2 127.0.0.1 >NUL && del /f %s" % (file, file)

     register(WindowsViewer)