Append is being used to append one image stack to another.

Input Description
Input1 First image stack to which the second image stack is being appended
Input2 Second image stack to be appended to the first one
Output Description
Output2 Appended image stack

Note: The imageID in the headers is not changed by append. This can lead to non-unique imageIDs. To set unique imageIDs, use the following command in the sql-logic:

SELECT *,img AS imageId FROM t0

This also adds the header entry img, though.