> hmmm PNG maybe the best REBOL bet. For example storing stuff in a named
> layer..

bingo!
http://www.libpng.org/pub/png/spec/PNG-Chunks.html#C.Anc-text
<quote>
4.2.3. Textual information
The iTXt, tEXt, and zTXt chunks are used for conveying textual information
associated with the image. This specification refers to them generically as
"text chunks".

Each of the text chunks contains as its first field a keyword that indicates
the type of information represented by the text string. The following
keywords are predefined and should be used where appropriate:

   Title            Short (one line) title or caption for image
   Author           Name of image's creator
   Description      Description of image (possibly long)
   Copyright        Copyright notice
   Creation Time    Time of original image creation
   Software         Software used to create the image
   Disclaimer       Legal disclaimer
   Warning          Warning of nature of content
   Source           Device used to create the image
   Comment          Miscellaneous comment; conversion from
                    GIF comment

</quote>

Any REBOL scripts out there for browsing/editing PNG binary data?

- Jason

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