You will indeed be able to measure the opening of emails thanks to the Piano Analytics SDK. In order to track the opening of emails with Piano Analytics tagging, it is mandatory to create a raw event, embedded in emails inside an <img> tag.
To do this, you will need to use the "email.display.offsite" event.
An invisible pixel that must be implemented at the top of your email to be loaded as soon as the email is opened and thus send the opening hit to our servers.
Here is an example code for the web beacon:
<img src="https://<collection-domain>/event?s=<site-id>&events=%5B%7B%22name%22%3A%22email.display.offsite%22%2C%22data%22 %3A%7B%22src_medium%22%3A%22email%22%2C%22src_campaign%22%3A%22email%20campaign%22%7D%7D%5D">
As you will see, you will need to adapt the "src" attribute with your collection domain, as well as with the site ID.
These can be found in the "Site Management" interface of your interfaces: https://collection.atinternet-solutions.com/#/sites-management.
This way of proceeding is based on the Collection API. A lot of information is available on this subject by following the following link: https://developers.atinternet-solutions.com/piano-analytics/data-collection/how-to-send-events/collection-api#get.
You can modify the values of "src_medium" and "src_campaign" according to your wishes.
More information on email open tagging can be found at: Email Open Measurement.