Thanks, Andrew.
After sending my email, I came across Exiftool and Exiv2. Both seemed to do the 
trick, but the problem I am running into has to do with the way Photoshop reads 
and writes IPTC data - which seems to be non-standard (what a surprise). If I 
write the IPTC metadata in Photoshop, it’s invisible to the readers in those 
programs. And, if I write the data with those programs, Photoshop does not see 
it.

Looking through the docs for Exiftool, I believe it might be because PS puts 
the data in its own category header area. Unfortunately, I need the data to be 
viewable in PS. So, I am now researching a bit more to see if there is a 
standalone/commandline tool that will read and write Photoshop’s metadata…

Thanks!
Rich


On Mar 31, 2014, at 3:58 PM, Andrew Mumford <[email protected]> wrote:

>  Exiftool - http://www.sno.phy.queensu.ca/~phil/exiftool/ is bulletproof and 
> cross platform ...
> ---
> Andrew Mumford
> 
> [email protected]
> 1 (310) 619 0208
> 
> 
> 
> 
> On Mar 31, 2014, at 12:47 PM, Richard Bobo <[email protected]> wrote:
> 
>> Hi all,
>> 
>> Has anyone had to write IPTC metadata in their PNG output images before? 
>> And, if so, how did you do it? I need to output PNGs with some metadata that 
>> can be viewed in Photoshop under the IPTC tab of the File Info command...
>> 
>> Thanks for any help,
>> Rich
>> 
>> Rich Bobo 
>> Senior VFX Compositor
>> Email:  [email protected]                     
>> Mobile:  248.840.2665
>> Web:  http://richbobo.com
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