It all depends on what and how was hidden in an image, we had some interesting talks about the topic and tried also to work on some Q images (no other ones), problem is, some types of encryption / spoofing / hiding / method you prefer, are writing metadata and actual bytes in the image, some may show up in the picture analysing it (like information in a specific pixel or set of / stereograms / Marks / etc ), others, purely within the headers or in some unused sectors, will be likely altered / wiped from images that are not the source one, ex when uploaded on socials and specially when they get "thumbnailed" or similar ( a new raw file is made but generally retains the lowest possible information's from the original as should be a low res one) , best advice is, if you spot an image that looks interesting, check first from where it is coming, and when possible try to reverse lookup or find the source for the original one