Philippe PEYRACHE

I am on a Linux Mint Distro. I used Clonezilla to create a disk image. This file has been stored on a disk which was unfortunatelly erased. I tried a photorec rescue, but it doesn t get the signature file for the IMG file of Clonezilla. it tried the searching and found nothing. Where and how could I find the File Signature for this type of file? knowing that I can add this in database of photorec? Many thanks for your help.