When you train HPE Media Server you must provide one training image for each image comparison reference.
A good training image for image comparison:
should measure at least 400 pixels along the shortest dimension.
is not blurry.
has not been converted from another file format to JPEG. Converting images to JPEG can introduce compression artifacts. If you have JPEG images, avoid making many rounds of edits. Each time that a new version of the image is saved as a JPEG, the image quality degrades.