Use this Plone commandline script to learn more about working with images in Plone

learn_about_images.py

################################
#  
#  run this script using
#  bin/instance -OPlone run {scriptname}
#  assumptions:
#   we assume that you have a working zope server with an instance
#   of plone located at the root named "Plone"
#   we also assume that you have an image named "
#
##################################################
from plone import api
import transaction

from AccessControl.SecurityManagement import newSecurityManager
from AccessControl.SecurityManager import setSecurityPolicy
from Testing.makerequest import makerequest
from Products.CMFCore.tests.base.security import PermissiveSecurityPolicy, OmnipotentUser

def spoofRequest(app):
    """
    Make REQUEST variable to be available on the Zope application server.
    This allows acquisition to work properly
    """
    _policy=PermissiveSecurityPolicy()
    _oldpolicy=setSecurityPolicy(_policy)
    newSecurityManager(None, OmnipotentUser().__of__(app.acl_users))
    return makerequest(app)

# Enable Faux HTTP request object so we can do "browsery" things on the cmd
app = spoofRequest(app)
request = app.REQUEST

site = app['Plone']
print site.Title()
api.portal.get()
portal = api.portal.get()
test_image = portal['new-alteroo-logo.png']

# this is an example of retrieving a browser view object
scale_util = api.content.get_view(
               'images',
               test_image,
               request)

# details about an image are stored using
# annotation storage is an object oriented BTree style storage system
# see: https://docs.plone.org/develop/plone/persistency/storage.html#storing-as-attribute-vs-storing-in-btree
storage = AnnotationStorage(test_image,
                            test_image.modified)
                            
# return a list of image properties
storage.items()

# have fun doing other debugging
# try doing a google search for the "tag" method
# this is provided by the scale_util and does some cool stuff
# tag = scale_util.tag('image', 'mini')
import ipdb;ipdb.set_trace()
transaction.commit()