[IPP] Registration template for "jpeg-features-supported (1setOf type2 keyword)"

[IPP] Registration template for "jpeg-features-supported (1setOf type2 keyword)"

[IPP] Registration template for "jpeg-features-supported (1setOf type2 keyword)"

Michael Sweet msweet at apple.com
Wed Oct 21 15:37:11 UTC 2015


Harry,

Thanks for this.  After reviewing the section on JPEG, it looks like the only keyword I haven't covered is 'hierarchical'.  The referenced document also includes some good information on how each of the features is implemented in JPEG...


> On Oct 21, 2015, at 11:10 AM, Harry.Lewis at ricoh-usa.com wrote:
> 
> Hi Michael. I think the "jpeg-features-supported" attribute is a good idea and your registered keywords make sense. I don't know how useful anyone in the PWG will find this but, in the same wheelhouse, the AFPC has defined (print) "subsets" for several widely available formats TIFF, JPEG, PNG and SVG (not published yet). The AFP subset for JPEG was submitted to ISO in 2011 and became or formed the basis for ISO/IEC 10918-6 Application to printing systems <https://www.iso.org/obp/ui/#iso:std:iso-iec:10918:-6:ed-1:v1:en> now a published ISO standard. I'm not suggesting this intersects 100% with Apple's attributes but mention it as FYI in case you might find it helpful in general. It has been a while since ISO published and I don't recall what additions or changes may have occurred so persons really interested are advised to purchase the ISO standard. Meanwhile, the AFPC document is freely available <http://afpcinc.org/wp-content/uploads/2014/04/AFPC-Subsets-v2.0.pdf> and the PWG is free to reference the document if that ever makes sense.   
> 
> Harry Lewis
> AFPC President & Secretary
> Program Manager IP & Standards
> Phone: 720-663-3456
> e-mail: harry.lewis at ricoh-usa.com
> <Mail Attachment.gif> 
> 
> 
> 
> From:        Michael Sweet <msweet at apple.com> 
> To:        ipp <ipp at pwg.org> 
> Date:        10/21/2015 05:56 AM 
> Subject:        [IPP] Registration template for "jpeg-features-supported (1setOf type2 keyword)" 
> Sent by:        ipp-bounces at pwg.org 
> 
> 
> 
> All,
> 
> Apple would like to register a new "jpeg-features-supported (1setOf type2 keyword)" attribute for the purpose of describing the optional features that a Printer supports in the JPEG file interchange format (JFIF, image/jpeg MIME media type). The following keyword values will initially be registered:
> 
> - 'none': The Printer only supports the baseline JFIF format; this keyword only appears by itself.
> - 'arithmetic': The Printer supports arithmetic encoding.
> - 'cmyk': The Printer supports CMYK images.
> - 'deep': The Printer supports more than 8 bits per component.
> - 'icc': The Printer supports embedded ICC profiles.
> - 'lossless': The Printer supports lossless JPEG encoding.
> - 'progressive': The Printer supports progressive encoding.
> 
> The primary purpose of this attribute is to allow the Client to determine whether a JPEG file can be printed directly or must be converted to an alternate form (e.g. PWG Raster) prior to printing.  Because of the way many printers process JPEG files, some features (ICC and CMYK support in particular) are silently ignored if not supported, leading to incorrect output (otherwise we could look for a document-format error and retry...)
> 
> ....
> 
> Printer Description attributes:                                                                                     Reference
> ------------------------------                                                                                     ---------
> jpeg-features-supported (1setOf type2 keyword)                                                   [APPLE20151021]
> 
> 
> Attributes (attribute syntax)
>  Keyword Attribute Value                                                                                     Reference
>  -----------------------                                                                                     ---------
> jpeg-features-supported (1setOf type2 keyword)                                                   [APPLE20151021]
>  arithmetic                                                                                                                        [APPLE20151021]
>  cmyk                                                                                                                                         [APPLE20151021]
>  deep                                                                                                                                         [APPLE20151021]
>  icc                                                                                                                                         [APPLE20151021]
>  lossless                                                                                                                        [APPLE20151021]
>  none                                                                                                                                         [APPLE20151021]
>  progressive                                                                                                                        [APPLE20151021]
> 
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
> 
> _______________________________________________
> ipp mailing list
> ipp at pwg.org
> https://www.pwg.org/mailman/listinfo/ipp <https://www.pwg.org/mailman/listinfo/ipp>
> 

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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