tkInter scoping problem ?

[bernard]

To display an image on a canvas I tried

PhotoImage(name=name, file="./" + name + ".gif")
c.create_image(x, y, anchor=NW, image=name)

which works fine.

However when I use this code in the __init__ method of a class

class TeleTubby:
   def __init__(self, c, name, x, y):
      PhotoImage(name=name, file="./" + name + ".gif")
      c.create_image(x, y, anchor=NW, image=name)
      ...

I get the error 
      tcl Error: image "tinky" doesn't exist

Then trying

      self.pic = PhotoImage(file="./" + name + ".gif")
      c.create_image(x, y, anchor=NW, self.pic)
      
this time I get no error but no image.

But then this worked fine

     global pic
     pic = PhotoImage(file="./" + name + ".gif")
     c.create_image(x, y, anchor=NW, pic)

and so did using a class variable
     
     TeleTubby.pic = PhotoImage(file="./" + name + ".gif")
     c.create_image(x, y, anchor=NW, image=TeleTubby.pic)


Why is this ? And is there any way I can get the first two formulations
(image name or instance variable) to work in the context of a class
method ?

Confused-ly - bernard