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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Michael,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for your reply. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have been able to parse the PWG-raster file successfully to obtain plain RGB data – but only from the one, present in the directory “PWGRasterSamples” obtained from : <a href="http://ftp.easysw.com/pub/cups/examples/PWGRasterSamples.zip">http://ftp.easysw.com/pub/cups/examples/PWGRasterSamples.zip</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The specific PWG raster file used is : “img_6461.jpg-srgb-8-150dpi.pwg”<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I was able to write the parser based on the specifications described in the PWG draft document.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I tried using “Rasterview” from </span><a href="http://www.easysw.com/~mike/rasterview/">http://www.easysw.com/~mike/rasterview/</a> <span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>running on Ubuntu 10.10, to open the file mentioned above, “img_6461.jpg-srgb-8-150dpi.pwg”. I received an error, “Unable to read page data: Resource temporarily unavailable”<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Using the tools/maketestfiles.sh, I was able to create a raster file with magic number, “3SaR” and not “RaS2”, which I don’t think is a PWG raster (?). I used the pstoraster filter. This generated file opens fine with RasterView v1.2.1. , FYI.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I was able to “/fetch” a pwg raster file from Google Cloud Print (GCP), by creating a print job from a pdf file. (location of pdf file: </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><a href="ftp://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippraster10-20110327-rev.pdf">ftp://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippraster10-20110327-rev.pdf</a>). </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I was not able to open this PWG raster file, with RasterView, nor was I able to parse this file completely using the parser that was developed based on PWG draft specifications. (I was able to obtain about 1/6th of the file converted to RGB data successfully, the rest – was not decoded, and appeared as ‘0x00’ for the remainder of the raster data.)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Are there different versions of the PWG raster file?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Perhaps GCP is not using the latest PWG specifications? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Is RasterView not updated to parse the latest PWG files?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Roy Samuel.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Michael Sweet [mailto:msweet@apple.com] <br><b>Sent:</b> Sunday, May 01, 2011 6:02 AM<br><b>To:</b> Roy Samuel<br><b>Cc:</b> ipp@pwg.org<br><b>Subject:</b> Re: Question on PWG draft specification mismatch & parsing<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Apr 28, 2011, at 9:46 PM, Roy Samuel wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span class=apple-style-span><span style='font-size:11.5pt;font-family:"Calibri","sans-serif"'>...</span></span><o:p></o:p></p></blockquote><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span class=apple-style-span><span style='font-size:11.5pt;font-family:"Calibri","sans-serif"'>I found that neither of the directories contained files that adhered to the draft document w.r.t parsing the header. Specifically for the value of ‘NumColors’.</span></span><span class=apple-style-span><span style='font-size:13.5pt;font-family:"Andale Mono","serif"'><o:p></o:p></span></span></p><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>--1--<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>According to the draft document, bytes 420-423 need to contain ‘NumColors’ value, however, I found them to be zero. Are the sample files outdated??<o:p></o:p></span></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>Not exactly outdated, just the code that generated them (and the page headers) contains an error. I will post updates next week.<o:p></o:p></p></div><div><p class=MsoNormal><span class=apple-style-span><span style='font-size:11.5pt;font-family:"Calibri","sans-serif"'> </span></span><o:p></o:p></p></div><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>--2--<o:p></o:p></span></p></div></div><p class=MsoNormal><span class=apple-style-span><span style='font-size:11.5pt;font-family:"Calibri","sans-serif"'>...</span></span><o:p></o:p></p></blockquote><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span class=apple-style-span><span style='font-size:11.5pt;font-family:"Calibri","sans-serif"'>(I use GIMP to open the output raster file in RAW mode).</span></span><span class=apple-style-span><span style='font-size:13.5pt;font-family:"Andale Mono","serif"'><o:p></o:p></span></span></p><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>I have attached a screenshot of the output file that I’m able to view through GIMP (scaled down version).</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Is my algorithm wrong? Or are the specs incorrect?<o:p></o:p></span></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>I would suspect the former since the compression code that generated the files has been in use for many years now.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Another tool you can use is RasterView, available here (with source):<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal> <a href="http://www.easysw.com/~mike/rasterview/">http://www.easysw.com/~mike/rasterview/</a><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black'>__________________________________________________<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black'>Michael Sweet, Senior Printing System Engineer, PWG Chair<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></div><br />--
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