Please describe the problem:
When the sync process is configured to resize the original pictures, the resulting copies don't include the original's EXIF metadata.

Steps to reproduce:
1. Setup a sync group from a folder containing any modern digital camera pictures to "Picasa". Configure Picasa to resize the original pictures.
2. Sync the group
3. Open Picasaweb, go to the chosen album and open one picture. On the right side of the page, press "more info".


Actual results:
You can see the uploaded picture's metadata is empty, while most digital cameras include fields such as aperture size, shutter speed, etc...

Expected results:
Uploaded picture should respect original's metadata.

Does this happen every time?
Yes

Other information:
The following patch against SVN 1681 solves it, but it'll make conduit depend on python-pyexiv2 library:

<----------------------------------------------------------------------------->
Index: PhotoConverterModule.py
===================================================================
--- PhotoConverterModule.py	(revisión: 1681)
+++ PhotoConverterModule.py	(copia de trabajo)
@@ -37,14 +37,16 @@
                         types[t] = None
             self._image_types = types
         return self._image_types
-        
+
     def _convert(self, photo, format, width, height, doResize, doReformat):
         """
-        Basically we defer the conversion until as late as possible, or 
+        Basically we defer the conversion until as late as possible, or
         not at all.
         """
         import gtk.gdk
+        import pyexiv2
 
+        in_file = photo.URI.path
         pb = photo.get_photo_pixbuf()
         out_file = photo.to_tempfile()
 
@@ -54,17 +56,32 @@
                 pb = pb.scale_simple(width,height,gtk.gdk.INTERP_HYPER)
             except Exception, err:
                 log.debug("Photo: Error scaling photo\n%s" % err)
-        
+
         #save to new format. gdk.Pixbuf needs the type argument
         if doResize or doReformat:
             log.debug("Photo: Saving photo:%s Format:%s" % (out_file,format))
             pb.save(out_file, format)
+
+            # Copy metadata to modified file
+            orig = pyexiv2.Image(in_file)
+            out = pyexiv2.Image(out_file)
+
+            orig.readMetadata()
+            out.readMetadata()
+
+            for key in orig.exifKeys():
+                try:
+                    out[key] = orig[key]
+                except ValueError:
+                    log.debug("Error copying EXIF tag %s" % key)
+            out.writeMetadata()
+
             #can safely rename the file here because its defintately a tempfile
             photo.force_new_file_extension(".%s" % format)
 
     def transcode(self, photo, **kwargs):
         log.info("Transcode Photo: %s" % kwargs)
-        
+
         #default format is the current format, and default is no resize
         formats = kwargs.get("formats",photo.get_mimetype()).split(',')
         newSize = kwargs.get("size",NO_RESIZE)
<----------------------------------------------------------------------------->