Steps to replicate?
What picture? and you are just looking at the hex data? No password or decrypting , etc?
Notepad++ not an option right now because of OSX. If you can post python code / something I can run I'll run it.
However, I WAS able to confirm the two images posted by >>1333291 match their sha256 values. e.g., if you run this in terminal:
openssl sha256 f37cacad979dc2bc90cd1699218c1b268a94ffdb5e3287870adce6b1a582f9aa.png
And the result is: f37cacad979dc2bc90cd1699218c1b268a94ffdb5e3287870adce6b1a582f9aa
which matches the name of the file. So I presume there is a reason to go through all the trouble to make sure to verify that those images have not been modified by a single bit. Additionally, I was not able to compress the two images. (Though admittedly I didn't try very hard). Both together strongly implies there is some information there.