Loading an image

[Chae Min Ho]

Hello Python lovers..
I'm trying to load an image file with PIL like
the following:

from Tkinter import *
import Image, ImageTk

photo = ImageTk.PhotoImage(Image.open("London1.jpg"))
canvas.create_image(10, 10, anchor=NW, image=photo)

And this is the error message that I got.

Traceback (innermost last):
File "photo.py", line 4, in ?
photo = ImageTk.PhotoImage(Image.open("London1.jpg"))
File "C:\Py14\pil\Lib\ImageTk.py", line 36, in __init__
self.__tk = Tkinter.PhotoImage()
File "C:\Py14\Lib\tkinter\Tkinter.py", line 1593, in __init__
apply(Image.__init__, (self, 'photo', name, cnf), kw)
File "C:\Py14\Lib\tkinter\Tkinter.py", line 1561, in __init__
if not master: raise RuntimeError, 'Too early to create image'
RuntimeError: Too early to create image

Anyone can help on this problem?
I'll appreciate any comment or any other ways to load an image.
Thank you.

Minho

[Steven D. Majewski]

On 6 Feb 1997, Chae Min Ho wrote:

> Hello Python lovers.. I'm trying to load an image file with PIL like
> the following:
>
> from Tkinter import *
> import Image, ImageTk
>
> photo = ImageTk.PhotoImage(Image.open("London1.jpg"))
> canvas.create_image(10, 10, anchor=NW, image=photo)
>
> And this is the error message that I got.
>

> if not master: raise RuntimeError, 'Too early to create image'

> RuntimeError: Too early to create image

I fell over what looks like the same problem with Tkinter/without PIL.
( It was the same error message. )
Python/Tkinter seems, for some reaso,n to be fussier than Wish/Tcl/Tk
about the order of some operations. When I made sure the canvas.pack()
method was called before create_image, the errors went away.

[ I've been working on a small sample GUI app in Tck/Tk, Python/Tkinter,
and Java/AWT for comparison. I hope I can finish and post them
Real Soon. ]

---| Steven D. Majewski (804-982-0831) <sd...@Virginia.EDU> |---
---| Department of Molecular Physiology and Biological Physics |---
---| University of Virginia Health Sciences Center |---
---| P.O. Box 10011 Charlottesville, VA 22906-0011 |---
By doing just a little every day, you can gradually
let the task completely overwhelm you.

[Fredrik Lundh]

> RuntimeError: Too early to create image

This is a Tkinter error, not a PIL error. You must initialize Tkinter
(by creating a Tk root object) before you can create photoimages.
Try:

from Tkinter import *
import Image, ImageTk

root = Tk()

canvas = Canvas(root, height=100, width=100)

photo = ImageTk.PhotoImage(Image.open("London1.jpg"))
canvas.create_image(10, 10, anchor=NW, image=photo)

/F

[Fredrik Lundh]

> Python/Tkinter seems, for some reaso,n to be fussier than Wish/Tcl/Tk
> about the order of some operations. When I made sure the canvas.pack()
> method was called before create_image, the errors went away.

But the reason here was that before you create the first Tk() object,
there's no Tcl interpreter available (wish obviously has an advantage
here ;-)

This is a general problem with Tkinter; since almost all operations in
there need a Tcl/Tk-context, there's some pretty ugly _default_root
magic in there to handle cases when you don't have a widget handy. An
alternative could perhaps be to create a Tcl context when the _tkinter
was first initialized, but that might probably cause unwanted side-
effects in other cases...

Cheers /F

[Chae Min Ho]

Fredrik Lundh (Fredri...@ivab.se) wrote:

: > RuntimeError: Too early to create image

: /F

Well, I followd exactly what you recommended.
But this time I got this error.

Traceback (innermost last):
File "photo.py", line 7, in ?

photo = ImageTk.PhotoImage(Image.open("London1.jpg"))

File "C:\Py14\pil\Lib\ImageTk.py", line 39, in __init__
self.paste(image)
File "C:\Py14\pil\Lib\ImageTk.py", line 47, in paste
block = Image.core.new_block(self.__mode, self.__size)
File "C:\Py14\pil\Lib\Image.py", line 23, in __getattr__
raise ImportError, "The _imaging C module is not installed"
ImportError: The _imaging C module is not installed

I didn't delete any module.
Do you know why this occurs?
Thank you again for your precious advice.

Min Ho

[Fredrik Lundh]

> ImportError: The _imaging C module is not installed

As in the previous case, the error message means exactly what it says.

> I didn't delete any module.

Was PIL properly installed in the first place? Is there an
_imagingmodule.so (or _imaging.dll) in the path? See the material
available at http://www.python.org/sigs/image-sig/Imaging.html for
more information.

Cheers /F