By using the inspectlet-src attribute in image tags in your HTML, you can override the src attribute as seen by Inspectlet for session recordings and heatmaps.
An image tag with the following HTML:
<img src="https://cdn.example.com/example.jpg" inspectlet-src="https://www.example.com/example.jpg">
will show to a user visiting your site the image located at "https://cdn.example.com/example.jpg", but during Inspectlet session playback and heatmap rendering, the image will be loaded from "https://www.example.com/example.jpg". The original src attribute is not sent to Inspectlet.