Image Charts embed a publicly hosted image directly into the chart. All that is required is to select a URL in single quotes, and Periscope automatically renders the image associated with the URL.
The example below shows the necessary syntax to use an Image Chart.
This query results in the image seen below:
The Image Chart Type also supports .gif images in addition to .png, .jpg, and .svg. The main requirement is that the URL must be static and publicly addressable.