Reverse the image in the camera instead?

PPT doesn't have a reversing option.

Actually, that probably isn't as difficult as it sounds.

Write some code to loop through each of the slides.

On Each slide, loop through each shape

For each shape,

   save it as a picture
   add a new shape (picture) that uses the picture you just created as its
source
   Rotate the picture (activewindow.selection.shaperange.flip
msoFlipHorizontal)
   Then, to make sure it appears the same way in reverse, you will need to
reposition it on the page so that its right side is the same distance from
the right margin as the left side was from the original left margin.

If you record a macro and do this once, it should be relatively easy to take
it to the next step by looping through each of your slides and the shapes in
a slide.  The only hard part will be figuring out the new Left property for
the image, and thats just a matter of figuring out the total width of the
slide and setting:

newShape.left = SlideWidth - newshape.width - oldShape-left

or something like that.

HTH

Richard

When you say Ute's idea "kind of sucks" I 'm supposing that you really mean
"I can see that's the only way but it would take a long time"

As Dale suggests it could be automated. You might like to play with this
code and see if it will help

Sub reverso()
Dim opres As Presentation
Dim Icount As Integer
Dim i As Integer
Dim c As Integer
Dim opic As Shape
Dim osld As Slide

Set opres = ActivePresentation
Icount = opres.Slides.Count
opres.SaveAs Environ("TEMP") & "\myslides", ppSaveAsPNG

For i = 1 To Icount
Set osld = opres.Slides(i)
For c = osld.Shapes.Count To 1 Step -1
osld.Shapes(c).Delete
Next c

Set opic = osld.Shapes.AddPicture(Environ("TEMP") & _
"\myslides\slide" & CStr(i) & ".png" _
, msoFalse, msoCTrue, 0, 0, opres.PageSetup.SlideWidth, _
opres.PageSetup.SlideHeight)
opic.Flip (msoFlipHorizontal)
Next
End Sub