problem with determining the size of a picture in Tkinter

Question

I tried to put a picture into my Tkinter window,that worked,but the picture was waaaay to big,so I tried it with this:

img = PhotoImage(file=r"C:\\Users\\ulric\\Desktop\\PNG_transparency_demonstration_2.png")
label2 = Label(window, image=img,height = "200px",width="200px")
label2.grid(row=0, column=1)

But all that did was to crop the picture and that isn't what I wanted,I just want to make the picture smaller. Could someone please help me? That would be very nice...