<div dir="ltr">Thank you William for your answer.<div><br><div>Actually I saw in the release notes ( <a href="http://poppler.freedesktop.org/releases.html">http://poppler.freedesktop.org/releases.html</a> ) what you mention. The 0.17.2 introduces the optimization you are talking about:</div><div><a href="http://poppler.freedesktop.org/poppler-0.17.2.tar.gz" style="color:rgb(173,173,173);font-family:Sans;font-size:medium;background-color:rgb(237,237,237)">poppler-0.17.2.tar.gz</a><span style="color:rgb(0,0,0);font-family:Sans;font-size:medium;background-color:rgb(237,237,237)"> (Mon Aug 15, 2011):</span><span style="color:rgb(0,0,0)"> PSOutputDev: Make level1sep, level2sep and level3sep write gray instead of rgb for gray images</span><br></div></div><div><span style="color:rgb(0,0,0)"><br></span></div><div><font color="#000000">Yes it makes a problem for me, and it would be great to have this feature. How can I proceed to have it? I'm a java developer, not comfortable in C/C++... not sure I would be able to make a pull-request in git.</font></div><div><span style="color:rgb(0,0,0)"><br></span></div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-02-04 17:44 GMT+01:00 William Bader <span dir="ltr"><<a href="mailto:williambader@hotmail.com" target="_blank">williambader@hotmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">I think that the cause is a patch that I submitted in May 2011 around the time of poppler 0.17.0.<div><br></div><div>Search for isGray in poppler/PSOutputDev.cc</div><div><br></div><div>I use pdftops to make postscript files that will be printed on a newpaper press.</div><div><br></div><div>My application was being sent PDFs with embedded logos that looked gray but were actually in RGB color space, and they were not getting separated correctly on color pages.</div><div><br></div><div>I added a check in PSOutputDev that if every pixel of a RGB bitmap was equal R, G, B, it will be written as a grayscale bitmap, which fixed my separation problems and made the files smaller.</div><div><br></div><div>If that makes a problem for you, it should be possible to add a command line option to control the RGB to grayscale conversion, maybe similar to some of the distiller options in ghostscript <a href="http://ghostscript.com/doc/current/Ps2pdf.htm" style="font-size:12pt" target="_blank">http://ghostscript.com/doc/current/Ps2pdf.htm</a></div><div><br></div><div>William<br><br><div><hr>Date: Wed, 4 Feb 2015 16:18:59 +0100<br>From: <a href="mailto:benjamin.lefevre@photobox.com" target="_blank">benjamin.lefevre@photobox.com</a><br>To: <a href="mailto:poppler@lists.freedesktop.org" target="_blank">poppler@lists.freedesktop.org</a><br>Subject: [poppler] pdftops : issue with colorspaces with some printers (gray vs rgb)<div><div class="h5"><br><br><div dir="ltr"><div><div dir="ltr"><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)">Hi everyone,</span></span></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)"><br></span></span></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px">My name is Benjamin and I am french.</span></font></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)"><br></span></span></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)">I'm new on this mailing list :)</span></span></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)"><br></span></span></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)"> I come to you for a question or maybe for a feature request (at this stage, I'm not sure).</span></span></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)"><br></span></span></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)">Please look at this pdf (dropbox: </span></span><a style="font-size:small" href="https://www.dropbox.com/s/yoj6h3o4irnlgun/source.pdf?dl=0" target="_blank"><font color="#222222">https://www.dropbox.com/s/yoj6h3o4irnlgun/source.pdf?dl=0 )</font></a></p><p style="font-size:12.8000001907349px"><a style="font-size:small"><font color="#222222"><br></font></a></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)">There are two monochrome images (in DeviceRGB in the pdf).</span></span></p><p style="font-size:12.8000001907349px"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:rgb(153,153,153)"><span style="color:rgb(17,85,204)"><br></span></span></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px">After executing 'pdftops', the images are cut in half, with the top part in DeviceRGB and the bottom in DeviceGray. This causes colorimetric issues on some of my printers (most of them in fact).</span></font></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px"><br></span></font></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px">Is it possible to preserve DeviceRGB by executing pdftops? I did not manage to achieve it with the few available options provided by pdftops.....</span></font></p><p><a></a></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px">Or would it be possible to have a new option in poppler (pdftops in my case) to preserve colorspaces, and to not optimize the monochrome images in DeviceGray? </span></font></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px"><br></span></font></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px">Thank you in advance,</span></font></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px"><br></span></font></p><p style="font-size:12.8000001907349px"><font color="#1155cc" face="Tahoma, sans-serif"><span style="font-size:13.3333330154419px">Benjamin.</span></font></p><p><a><font color="#222222"><br></font></a></p><p><a><font color="#222222"><br></font></a></p><p><a><br></a></p></div></div>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><p style="margin:0cm 0cm 0.0001pt;background-repeat:initial initial"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#999999">Benjamin Lefevre</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#999999"> </span><font color="#999999">Senior
Software Engineer / iWays & iRender</font><span lang="EN-US" style="font-size:10pt;font-family:Arial,sans-serif"></span></p>
<p style="margin:0cm 0cm 0.0001pt;background-repeat:initial initial"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#999999">Email<span style="white-space:pre-wrap"> </span></span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#999999"><a href="mailto:benjamin.lefevre@photobox.com" target="_blank">benjamin.lefevre@photobox.com</a></span><span style="font-size:10pt;font-family:Arial,sans-serif"></span></p>
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rue de Beauce - 78500 Sartrouville (France)</span><span style="font-size:10pt;font-family:Arial,sans-serif"></span></p>
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