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You can create an environment variable with the following code below, which can be used later with Bean Shell Hash Variable to convert the data to image base64bytes source.
As an example, we will create a new environment variable with the id "generateImage", while assuming that the table name is "table1" and signature field id is "field1".
Then, copy and paste the code below as the value of the "generateImage" environment variable.
After that, you may utilize Bean Shell Hash Variable to make use of this environment variable in your email content to display the signature as an image.