After I ran the stegdetect on 25611 .jp*g images in the qresearch/file_store
here are the interesting results…. (skipped negative, etc… seem that the following keywords are meaningful) appended, alpha-channel, camouflage
/qresearch/file_store$ cat results.steg1 | grep -E "appended|alpha-channel|camouflage"
results here
https://pastebin.com/cFvNAbgG