You should use Shapes.AddPicture as described here (archived version of this broken link):
from tkinter import *
import tkinter.filedialog as tkFileDialog
import win32com.client # middleman/translator/messanger between windows and python
import win32com.gen_py.MSO as MSO # contains constants refering to Microsoft Office Objects
import win32com.gen_py.MSPPT as MSPPT # contains constants refering to Microsoft Office Power Point Objects
g = globals() # a dictonary of global vlaues, that will be the constants of the two previous imports
for c in dir(MSO.constants): g[c] = getattr(MSO.constants, c) # globally define these
for c in dir(MSPPT.constants): g[c] = getattr(MSPPT.constants, c)
Application = win32com.client.Dispatch("PowerPoint.Application")
Application.Visible = True # shows what's happening, not required, but helpful for now
Presentation = Application.Presentations.Add() # adds a new presentation
Slide1 = Presentation.Slides.Add(1, ppLayoutBlank) # new slide, at beginning
TenptStr = Slide1.Shapes.AddShape(msoShape10pointStar, 100, 100, 200, 200)
pictName = tkFileDialog.askopenfilename(title="Please Select the Image you wish to load")
print(pictName)
Pict1 = Slide1.Shapes.AddPicture(FileName=pictName, LinkToFile=False, SaveWithDocument=True, Left=100, Top=100, Width=200, Height=200)
Note that the "choose file" option produces a file path with '/" rather than '' and you may need to replace the former by the latter.
