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<html><head><base href="x-msg://259/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">We need the definition in the spec, if for any reason to avoid getting the wrong interpretation.<div><br></div><div>Yes, some platforms align on words (I have seen 16-, 32-, and 64-bit alignment), but for PWG (CUPS) Raster we want 8-bit (octet) alignment. In practice this means that we only have extra/leftover bits for the 1-bit grayscale/black case since the other depths supported in PWG Raster are 8- and 16-bits per color.</div><div><br><div><div>On Apr 28, 2011, at 1:22 PM, Petrie, Glen wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: 'Andale Mono'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-US" link="blue" vlink="blue" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div class="Section1" style="page: Section1; "><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; ">Mike,<o:p></o:p></span></font></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; "><o:p> </o:p></span></font></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; ">Question on your definition of bytes-per-line (BPL): You have it ending at an octet (8-bit) but I have seen cases where the boundary is at the word or 32-bit level. In fact, I have seen were people clip a line by changing the number of pixel per line but not the bytes-per-line. What has been your experience? Suggestion: Leave the equation out of specification and it is understood or is stated that new raster lines begin at multiples of bpl.<o:p></o:p></span></font></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; "><o:p> </o:p></span></font></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; ">Glen<o:p></o:p></span></font></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; "><o:p> </o:p></span></font></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; "><o:p> </o:p></span></font></div><div><div class="MsoNormal" align="center" style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; text-align: center; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "><hr size="2" width="100%" align="center" tabindex="-1"></span></font></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold; ">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; "><span class="Apple-converted-space"> </span>Michael Sweet [mailto:msweet@apple.com]<span class="Apple-converted-space"> </span><br><b><span style="font-weight: bold; ">Sent:</span></b><span class="Apple-converted-space"> </span>Thursday, April 28, 2011 10:27 AM<br><b><span style="font-weight: bold; ">To:</span></b><span class="Apple-converted-space"> </span>Petrie, Glen<br><b><span style="font-weight: bold; ">Cc:</span></b><span class="Apple-converted-space"> </span><a href="mailto:ipp@pwg.org" style="color: blue; text-decoration: underline; ">ipp@pwg.org</a><br><b><span style="font-weight: bold; ">Subject:</span></b><span class="Apple-converted-space"> </span>Re: [IPP] (PWG) Raster Question on what is required</span></font><o:p></o:p></div></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "><o:p> </o:p></span></font></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; ">On Apr 28, 2011, at 10:21 AM, Petrie, Glen wrote:<o:p></o:p></span></font></div></div><blockquote type="cite" style="margin-top: 5pt; margin-bottom: 5pt; "><span style="orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-spacing: 0px; "><div link="blue" vlink="purple" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="black" face="Helvetica"><span style="font-size: 12pt; font-family: Helvetica; color: black; ">...</span></font><o:p></o:p></div></div></div></div></span></blockquote><blockquote type="cite" style="margin-top: 5pt; margin-bottom: 5pt; "><span style="orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-spacing: 0px; "><div link="blue" vlink="purple" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; ">libtiff (the most widely-used TIFF library) supports 16-bits per color.<u1:p></u1:p><o:p></o:p></span></font></div></div></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Times New Roman"><span style="font-size: 12pt; color: blue; "><u1:p> </u1:p></span></font><o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; ">I must be looking at the wrong version because TIFF 6.0 shows only <8,8,8><span class="apple-converted-space"> </span><a href="http://www.libtiff.org/support.html" style="color: blue; text-decoration: underline; ">http://www.libtiff.org/support.html</a></span></font><o:p></o:p></div></div></div></div></span></blockquote><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "><o:p> </o:p></span></font></div></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; ">Hmm, they must have removed 16-bit support at one point - back when I was doing print software for SGI workstations the "Sam Leffler" version of libtiff supported it...<o:p></o:p></span></font></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "><br><br><o:p></o:p></span></font></div><span style="orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-spacing: 0px; "><u1:p></u1:p><div link="blue" vlink="purple" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; ">... <o:p></o:p></span></font></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; ">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.<u1:p></u1:p><o:p></o:p></span></font></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; font-family: Cambria; color: blue; "><u1:p> </u1:p></span></font><o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; 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<u1:p></u1:p></span></font><o:p></o:p></div></div></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "></span><o:p> </o:p></font></div></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; ">Right.<o:p></o:p></span></font></div></span></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "><o:p> </o:p></span></font></div></div><div><blockquote type="cite" style="margin-top: 5pt; margin-bottom: 5pt; "><span style="orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-spacing: 0px; "><div link="blue" vlink="purple" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><span class="apple-style-span"><font size="3" color="blue" face="Cambria"><span style="font-size: 12pt; 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?</span></font></span><o:p></o:p></div></div></div></div></span></blockquote><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "><o:p> </o:p></span></font></div></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; ">Conformance for a printer means that it will advertise what it needs. For a client it means the client will transform the back side images as indicated by the printer.<o:p></o:p></span></font></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "><o:p> </o:p></span></font></div></div><div><span style="orphans: 2; widows: 2; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-spacing: 0px; "><div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><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></div></div></span></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="3" face="Times New Roman"><span style="font-size: 12pt; "></span><o:p> </o:p></font></div></div></div></span></blockquote></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div>__________________________________________________</div><div>Michael Sweet, Senior Printing System Engineer, PWG Chair<br></div></span>
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