Re: [media-types] image/webp rfc review

Hi Paul,

On Mon, May 3, 2021 at 12:17 PM Paul Libbrecht <paul=
40hoplahup.net@dmarc.ietf.org> wrote:

> Dear James,
>
> It seems that you have taken come steps toward my wish:
>
> File extension(s): webp
> Macintosh file type code: UTTypeWebP com.google.webp
>
> I am not sure what UTTypeWebP means (a property-list key?) but
> com.google.webp sounds to be an Apple Uniform Type Identifier
> <https://developer.apple.com/library/archive/documentation/Miscellaneous/Reference/UTIRef/>.
> Is that correct?
>
Yes. I found that when looking for something as a replacement for the
deprecated Macintosh code as you mention [3]. I notice now that its value
is 'org.webmproject.webp' not 'com.google.webp', however.

> My suggestion would be that you enrich your declaration so that it
> supports interoperability for clipboard exchanges between different apps.
> For this, I believe that you have to add a uniform type identifier
> (including the “conforms to” part, declaring a parent type) and a windows
> clipboard flavour name. At best this is defined already by implementing
> applications.
>
> I could imagine the following declaration to be sensible:
>
>    - Macintosh Uniform Type Identifier: com.google.webp conforms to
>    public.image and to public.data.
>
>
I think mentioning the direct relationship to public.image may be best
given you can follow it upwards past public.data. And maybe 'Apple Uniform
Type Identifier' would be more appropriate now.

>
>    - Windows Clipboard Flavour Name: WebP
>
>
I didn't see a registered reference for a standard clipboard format, but
GDI was updated to support the format with the ImageFormatWEBP GUID [4] .

>
>
> Feel free to revisit (add riff as one of the parent types?), reject, or
> consider this suggestion.
>
> Thanks in advance.
>
> Paul
>
> PS: I believe that the entry Macintosh file type code was for the 4-bytes
> code that used to be registered at Apple back then. I’ve been trying to
> push an update of the RFC6838 but haven’t yet got this to start.
>
[3]
https://developer.apple.com/documentation/uniformtypeidentifiers/uttypewebp/
[4]
https://docs.microsoft.com/en-us/windows/win32/gdiplus/-gdiplus-constant-image-file-format-constants

> On 30 Apr 2021, at 4:54, James Zern wrote:
>
> As a follow up to my original request [1] I drafted a rfc for the purpose
> of registering image/webp [2]. I'd appreciate it if you could review the
> content when you have time.
>
> [1] https://tools.iana.org/public-view/viewticket/1187000
> [2] https://datatracker.ietf.org/doc/draft-zern-webp/
>
> _______________________________________________
> media-types mailing list
> media-types@ietf.org
> https://www.ietf.org/mailman/listinfo/media-types
>
>
On Mon, May 3, 2021 at 12:17 PM Paul Libbrecht <paul=
40hoplahup.net@dmarc.ietf.org> wrote:

> Dear James,
>
> It seems that you have taken come steps toward my wish:
>
> File extension(s): webp
> Macintosh file type code: UTTypeWebP com.google.webp
>
> I am not sure what UTTypeWebP means (a property-list key?) but
> com.google.webp sounds to be an Apple Uniform Type Identifier
> <https://developer.apple.com/library/archive/documentation/Miscellaneous/Reference/UTIRef/>.
> Is that correct?
>
> My suggestion would be that you enrich your declaration so that it
> supports interoperability for clipboard exchanges between different apps.
> For this, I believe that you have to add a uniform type identifier
> (including the “conforms to” part, declaring a parent type) and a windows
> clipboard flavour name. At best this is defined already by implementing
> applications.
>
> I could imagine the following declaration to be sensible:
>
>    - Macintosh Uniform Type Identifier: com.google.webp conforms to
>    public.image and to public.data.
>    - Windows Clipboard Flavour Name: WebP
>
> Feel free to revisit (add riff as one of the parent types?), reject, or
> consider this suggestion.
>
> Thanks in advance.
>
> Paul
>
> PS: I believe that the entry Macintosh file type code was for the 4-bytes
> code that used to be registered at Apple back then. I’ve been trying to
> push an update of the RFC6838 but haven’t yet got this to start.
>
> On 30 Apr 2021, at 4:54, James Zern wrote:
>
> As a follow up to my original request [1] I drafted a rfc for the purpose
> of registering image/webp [2]. I'd appreciate it if you could review the
> content when you have time.
>
> [1] https://tools.iana.org/public-view/viewticket/1187000
> [2] https://datatracker.ietf.org/doc/draft-zern-webp/
>
> _______________________________________________
> media-types mailing list
> media-types@ietf.org
> https://www.ietf.org/mailman/listinfo/media-types
>
>