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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Michael Sweet
[mailto:msweet@apple.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 28, 2011
10:09 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Petrie, Glen<br>
<b><span style='font-weight:bold'>Cc:</span></b> ipp@pwg.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [IPP] (PWG) Raster
Question on what is required</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Apr 28, 2011, at 9:51 AM, Petrie, Glen wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'>In the (PWG) Raster, the specification states support for
16-bits per color. TIFF seems to the only image file format supporting it
and even the TIFF libraries I could find only support up to 8-bits per color.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>libtiff (the most widely-used TIFF library) supports 16-bits per color.<o:p></o:p></span></font></p>
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style='font-size:12.0pt;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Cambria><span style='font-size:
12.0pt;font-family:Cambria;color:blue'>I must be looking at the wrong version because
TIFF 6.0 shows only <8,8,8> <a href="http://www.libtiff.org/support.html">http://www.libtiff.org/support.html</a>
<o:p></o:p></span></font></p>
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<br>
<o:p></o:p></span></font></p>
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<p class=MsoNormal><span class=apple-style-span><font size=3 face=Cambria><span
style='font-size:12.0pt;font-family:Cambria'>While I believe the (PWG) Raster
specification indicates the range of possible values; will or is there is a
specification or compliance requirements on what must be supported? (The
same would apply to color spaces.)</span></font></span><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I thought I had included this, but couldn't find any requirements in
the PWG Raster or IPP Everywhere specs.<o:p></o:p></span></font></p>
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12.0pt;font-family:Cambria;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Cambria><span style='font-size:
12.0pt;font-family:Cambria;color:blue'>Not in (PWG) Raster spec (I believe it would
in section 4.3.4 or is there another section)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Cambria><span style='font-size:
12.0pt;font-family:Cambria;color:blue'>The conformance section (6.x) the “MUST”
for attributes but not for values <o:p></o:p></span></font></p>
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12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>My thought was to require sgray-1 and sgray-8 for all printers and
srgb-8 for color printers. <o:p></o:p></span></font></p>
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style='font-size:12.0pt;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Cambria><span style='font-size:
12.0pt;font-family:Cambria;color:blue'>Sound good to me.<o:p></o:p></span></font></p>
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12.0pt;font-family:Cambria;color:blue'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><span class=apple-style-span><font size=3 face=Cambria><span
style='font-size:12.0pt;font-family:Cambria'>Or is the situation that the
printer provides it capabilities, which must be one or more of the of the (PWG)
Raster values. Thus, there are no mandatory values just a possible range
of supported values.</span></font></span><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I think for interoperability we want a minimum set for interoperability
(and to address the use cases/design requirements). But most values of color
space and bit depth should be optional.<o:p></o:p></span></font></p>
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12.0pt;font-family:Cambria;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Cambria><span style='font-size:
12.0pt;font-family:Cambria;color:blue'>Ok, then from your color-spaces, the required
bits-per-color would 1 and 8. Also, the required bits-per-pixel would be 1,
8, 24<o:p></o:p></span></font></p>
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12.0pt;font-family:Cambria;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Cambria><span style='font-size:
12.0pt;font-family:Cambria;color:blue'>One more time. Does conformance to
pwg-raster-back-side mean “the printer will perform the indicated
transforms” or this is an identifier stating what the “state”
of the back-side image is?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 color=black face=Helvetica><span
style='font-size:13.5pt;font-family:Helvetica;color:black'>________________________________________________________________________<br>
Michael Sweet, Senior Printing System Engineer, PWG Chair<o:p></o:p></span></font></p>
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