Making hashes based on PNG read/stored data

[samjco]

So is it possible to make the hash also based on stored data of a png file.
As we know Png file can stores text data inside and still keep the image visual intact.

To extract what data is in a png file.. (e.g: flower.png) we can use:
https://github.com/DanielJDufour/read-png
or
https://github.com/hometlt/png-metadata

Data meta reference that is stored in PNGs:
https://dev.exiv2.org/projects/exiv2/wiki/The_Metadata_in_PNG_files

Is it possible to build the hash that duplicate-images create based on any stored data?
This will be the ultimate dup finder for png file atleast.