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<p class=MsoNormal><font size=3 color=blue face=Cambria><span style='font-size:
12.0pt;font-family:Cambria;color:blue'>Ok, we have a differing understanding of
some of the image processing involved in printing. While I still
disagree, I agree to disagree and will let the group decide the matter. <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><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> Monday, April 18, 2011 1:38
PM<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] More Discussion
on bi-level, mono-chrome and 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'>On Apr 18, 2011, at 11:38 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'>Can we change the required on mono to optional and
bi-level be required.<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'>Bi-level
required for any printer<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'>Color
required is color printer<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'>Mono
1 toner – optional<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'>Mono
>2
toners – optional<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'>And the other is the table are optional<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'><u1:p> </u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face=Cambria><span style='font-size:12.0pt;
font-family:Cambria'>Basically mono is a dithering of a single-color to produce
an output from saturation to white. But dithering is a fancy thresholding
(bi-level);</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'><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 don't agree with this. Thresholding is not dithering, which by
definition adds noise to the signal (in this case 2D color arrays) in order to
more accurately portray the signal given limited output capabilities. The usage
here is not to describe a particular algorithm but rather to specify intent:
high contrast black and white output. You'd use this mode when scanning and
printing forms, for example. (Oops - time for another thread...) It is
pretty clear I need to convert Table 2 to a list of paragraphs describing the
keywords and their meanings in detail.<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'><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'><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'>The current requirements map to use cases - color and grayscale
(monochrome) printing are required for our current use cases.
"Bi-level" is not, although it is something we should consider for
the scanned forms use case. We can continue to debate the requirements, but
every OS and just about every driver for a color printer includes UI to print
color as grayscale... If the intent is to allow a limited mobile client to do
the same, we need to ask the printer to help out, and we can decide whether
that means 1-color or process (N-color, N>1) black.<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'><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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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'></span><o:p> </o:p></span></font></p>
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