In message , R.Wieser
writes:
John,

_Does_ the .png format _have_ a metadata text field?

Yes. The below document describes the iTXt, tEXt, and zTXt "chukns", which
can be used to store such data.

https://dev.exiv2.org/projects/exiv2...a_in_PNG_files

Thanks. You, Java Jive, and Paul have confirmed that.

If so, what utility lets you see it, and ideally edit it?

I'm sorry, but I have absolutily no idea. Depending on your version of
Windows you might be able to add/edit them using :

rightclick on the image - properties - summary

(Doesn't work under XP)

Nor 7 (there is no "summary" tab [or even a "Summary" one]).

Java Jive said he used Paint Shop Pro to add some "information" to a
..png, and since he said he found the "strings" in the file afterwards, I
presume he meant text. I think I have PSP somewhere (IIRR even a Big
Version they made available when they wanted to close down servers or
something, though that may be something else), but it seems a bit of a
sledgehammer to load it just for this.

If not, try a google for "png edit exif" (EXIF is a kinda metadata
standard).

Regards,
Rudy Wieser


I'm just doing that. www.thexifer.net seems to be a web-based one.
ExifTool is a command line one, though there are GUI ones that use it.
Exif Pilot (https://www.colorpilot.com/exif.html) looks promising and
small (and free), and claims to do .png ... Trying: yes, seems to work.
(There's a "Comment" field. From the layout - it's a single line - there
might well be a size limit, and I suspect it won't allow line feeds.)

Had a term in the licence I haven't seen befo something like "you may
not use previous versions". I poked around in it and couldn't see any
mention of updates, but that doesn't mean it doesn't automatically get
them. (For the rare times I'm likely to use it, I CBA to be bothered.)
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

"Gentlemen, you can't fight in he this is the war room!" (Dr. Strangelove)