Proposed "XML:com.adobe.xmp" PNG keyword

[Glenn Randers-Pehrson]

On Thu, Oct 8, 2009 at 11:54 PM, Cosmin Truta <cosmin@...> wrote:

>  Re: [png-mng-misc] PNG and XMP already a way to consider storing metadata?
>  It is proposed to register the following new text keyword for
>  use in PNG files:
>
>  XML:com.adobe.xmp
>  Extensible Metadata Platform (XMP) information, formatted
>  as required by the XMP specification [XMP].  The use of iTXt,
>  with Compression Flag set to 0, and both Language Tag and
>  Translated Keyword set to the null string, are recommended
>  for XMP compliance.
>
>  References
>  [XMP]
>     Adobe Systems Inc., "XMP Specification", September 2005.
>     http://www.adobe.com/devnet/xmp/

Looks good to me.  Let's get libpng-1.4.0 out before voting on
this, though, because the current libpng does not support
iTXt by default, and you cannot even enable it without
manually editing pngconf.h.

I'll publish libpng-1.4.0rc01 very shortly, maybe later on
this week.

Glenn

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[Cosmin Truta]

On Fri, Oct 9, 2009 at 7:32 AM, Glenn Randers-Pehrson wrote:

> Let's get libpng-1.4.0 out before voting on
> this, though, because the current libpng does not support
> iTXt by default, and you cannot even enable it without
> manually editing pngconf.h.
>
> I'll publish libpng-1.4.0rc01 very shortly, maybe later on
> this week.

I personally didn't mind the long incubation period for 1.4.0. The
focus on constantly improving its quality was a good thing IMO.

Concerning the registation of XMP, we can vote on it now, or later, it
makes no difference. We waited 5 years, waiting a few more weeks won't
matter -- but we may as well do it now. We do have iTXt implemented
already, just not enabled by default, and to me, that still qualifies
as a valid prototype implementation. In comparison, we had sTER in
libpng after it was voted. And we don't even have dSIG yet.

Best regards,
Cosmin

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