Re: New? PNG Chunk Type

Bill, you could use a text chunk (tEXt, zTXt, or iTXt) to store that kind
of information.  Just use a private keyword of your own choosing, such
as "Background Location <location info>" or "Background Image Name <name>".

What page were you looking at when you hit the bad link?  If it's one of
our pages we could probably fix it, thanks.  The current Png Extensions
document is version 1.4.0, at
http://www.libpng.org/pub/png/spec/register/pngext-1.4.0-pdg.html

Glenn

On Tue, Mar 21, 2017 at 6:08 PM, Glenn Randers-Pehrson
<[email protected]> wrote:
> ---------- Forwarded message ----------
> From: Bill <bill-IRT3DlQCis/vnERs63wLqVaTQe2KTcn/@public.gmane.org>
> Date: Tue, Mar 21, 2017 at 6:05 PM
> Subject: New? PNG Chunk Type
> To: [email protected]
>
>
> I was not successful clicking on the PNG-EXTENSIONS link.  It was
> supposed to provide "PNG 1.2 Specification, Version 1.2.0".
>
> What I need is the ability to store the location of the camera so that
> I know which of several background images was used.  I already know
> the day the image was taken, but, I need to know which background was
> used that day for that camera for that picture.  In my case the
> background on any particular day is the same for the location.  As an
> alternative I could store the name of the background image - I would
> simply include the location name in the background image name.

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