This addon install picturefill in Plone and provide a suite of tools to display images from different kind of components such as brain, dexterity object or archetypes object.

This addon can be installed has any other addons. please follow official documentation

in template:

tal:content="structure myimage_object/@@polyfill"

in python:

from collective.picturefill.interfaces import IPictureFill
IPictureFill(brain)()

CSS: You should use this tricks if you want in your theme that picturefill fit the exact size of the container:

div[data-picture] img{
    width: 100%;
}

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