how to set context to run operations Here's another little issue I can't solve by myself:

I wrote a little python script called by blender from terminal (or dos cmd) that renders a scene letting you see the tiles composing the image like it does from "inside Blender" hitting the f12 button.

Now, I would like to popup a window with no menus and with the render result fitted in it.

This is what I do from terminal:

blender /path/to/file.blend -p 200 200 640 480 -P /path/to/python/script


This is the content of the python script:

import bpy
bpy.data.screens['screen_name'].scene = bpy.data.scenes['scene_name']
bpy.context.window.screen = bpy.data.screens['screen_name']
bpy.context.screen.scene = bpy.data.scenes['scene_name']

bpy.data.scenes['scene_name'].cycles.samples = 40
bpy.data.scenes['scene_name'].render.resolution_percentage = 50

#this "for" breaks all the code
for area in bpy.context.screen.areas:
   if area.type == 'IMAGE_EDITOR':
       override = bpy.context.copy()
       override['area'] = area
       bpy.ops.screen.screen_full_area(override, use_hide_panels=True)
       bpy.ops.image.view_all(override, fit_view=False)
       break

#what under work as intended without the "for"
bpy.ops.render.view_show('INVOKE_DEFAULT')
#renderizza
bpy.ops.render.render('INVOKE_DEFAULT', animation=False, write_still=True, use_viewport=False, scene='scene_name')


As I wrote in the comment in the py code, everything works just fine without the "for" code.
The error I got on Ubuntu is

RuntimeError: Operator bpy.ops.image.view_all.poll() failed, context is incorrect

On windows it adds a EXCEPTION_ACCESS_VIOLATION (windows always have to make some sort of drama :-)

What did I do wrong?

Thank you for your time and for you help.
Screen Full Area Opens a new Screen

A couple of prints in the following show that the context screen and henceforth area, after calling the bpy.ops.screen.screen_full_area() operator are not the same.  Change the override dictionary accordingly.  (btw running view all without the override core dumps my blender (ubuntu 18))

import bpy

context = bpy.context
for area in bpy.context.screen.areas:
   if area.type == 'IMAGE_EDITOR':
       override = bpy.context.copy()
       override['space_data'] = area.spaces.active
       override['region'] = area.regions[-1]
       override['area'] = area
       bpy.ops.screen.screen_full_area(override, use_hide_panels=True)

       print(context.area, override['area'])
       print(context.screen, override['screen'])
       print(context.window, override['window'])
       override['screen'] = context.screen
       override["area"] = context.area
       bpy.ops.image.view_all(override, fit_view=True)
       break