Save an image from the shell or programatically to Wagtail.

wagtall_save_image_from_shell.py

# Save an image from the shell or programatically to Wagtail
# If you are using a cutom Image model, please import your model
import os

from django.core.file import File

from wagtail.wagtailimages.models import Image

def save_image_to_wagtail(image):
    """
    Save a image to wagtail from the shell. 
  
    :image: path to you image
    """
    path, name = os.path.split(image)
    
    # Quick chec if the image is in the media dir
    # You can skip this if you know what you are doing
    if 'media' not in path:
        print('Your image {} is not in the media direcotry!'.format(name))
    
    f = open(image, 'rb')
    i = Image(title=name, file=File(f)
    i.save()