There needs to be an initialized wxApp to manipulate bitmaps in wxGTK

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16762 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wxPython/tools/img2img.py

@@ -4,6 +4,10 @@ Common routines for the image converter utilities.
 import sys, os, glob, getopt, string
 from wxPython.wx import *
 
+if wxPlatform == "__WXGTK__":
+    # some bitmap related things need to have a wxApp initialized...
+    app = wxPySimpleApp()
+
 wxInitAllImageHandlers()
 
 def convert(file, maskClr, outputDir, outputName, outType, outExt):