Thanks, Ira! Given the definition in section 5.6.29, it is clear to me that the set of images provided by the printer-icons attribute provide basically an "unpacked" equivalent of a .ICO file.
Smith
On 2012-03-17, at 11:51 AM, Ira McDonald wrote:
Hi Smith,
Here is the definition of "printer-icons" from the most recent
draft of IPP JPS3:
ftp://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippjobprinterext3v10-20120131.pdf
5.6.29 printer-icons (1setOf uri)
The REQUIRED "printer-icons" Printer attribute lists one or more Printer-resident images using "http:" or "https:" URIs. The referenced images MUST be RGBA PNG [RFC2083] format, have square dimensions of 48x48, 128x128, or 512x512 pixels, represent the physical appearance of the Printer, and show the same perspective/view of the Printer. If only one image is provided, it MUST have dimensions of 128x128 pixels. Images MUST be listed from smallest to largest dimensions. Images MUST provide an alpha channel to mask the background surrounding the printer.
The Abstract of RFC 2083 says:
"This document describes PNG (Portable Network Graphics), an
extensible file format for the lossless, portable, well-compressed
storage of raster images. PNG provides a patent-free replacement for
GIF and can also replace many common uses of TIFF. Indexed-color,
grayscale, and truecolor images are supported, plus an optional alpha
channel. Sample depths range from 1 to 16 bits.
PNG is designed to work well in online viewing applications, such as
the World Wide Web, so it is fully streamable with a progressive
display option. PNG is robust, providing both full file integrity
checking and simple detection of common transmission errors. Also,
PNG can store gamma and chromaticity data for improved color matching
on heterogeneous platforms.
This specification defines the Internet Media Type image/png."
Does that answer all your questions?
Cheers,
- Ira (co-chair of IPP WG)
Ira McDonald (Musician / Software Architect)
Chair - Linux Foundation Open Printing WG
Secretary - IEEE-ISTO Printer Working Group
Co-Chair - IEEE-ISTO PWG IPP WG
Co-Chair - TCG Trusted Mobility Solutions WG
Chair - TCG Embedded Systems Hardcopy SG
IETF Designated Expert - IPP & Printer MIB
Blue Roof Music/High North Inc
http://sites.google.com/site/blueroofmusichttp://sites.google.com/site/highnorthinc
mailto:blueroofmusic at gmail.com<mailto:blueroofmusic at gmail.com>
Winter 579 Park Place Saline, MI 48176 734-944-0094
Summer PO Box 221 Grand Marais, MI 49839 906-494-2434
On Sat, Mar 17, 2012 at 1:19 PM, Kennedy, Smith (Wireless Architect) <smith.kennedy at hp.com<mailto:smith.kennedy at hp.com>> wrote:
Greetings,
Can anybody provide me with some information about IPP and what facilities it provides to supply printer icons? I have found the "printer-icons" attribute in the IPP Everywhere specification, which refers me to PWG 5100.JSP3, but so far haven't been able to fully track down the definition of that attribute. Are there any other IPP operations or attributes for operations that provide icon information?
Are either PNG or Windows Icon (.ico) image file formats specified by any IPP specification as formats that must be used or supported? If the latter is specified or allowed, are there any royalty issues with using that format? And with PNG files, is there a facility for the Printer Object to supply a set of files at resolutions, sort of like an unpacked .ico file?
Thanks for any help or guidance,
Smith
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
_______________________________________________
ipp mailing list
ipp at pwg.org<mailto:ipp at pwg.org>
https://www.pwg.org/mailman/listinfo/ipp
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.