<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="EN-US" link="blue" vlink="purple"> <div class="WordSection1"> <p class="MsoNormal">What exactly do you mean by “rendering for printing”? Do you mean rasterizing the page to a “bitmap” OR conversion to a PDL such as Postscript OR something else?<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">The exactly output format plays a HUGE factor in whether color management (or any sort) is required or necessary.<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">Leonard<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in"> <p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">poppler <poppler-bounces@lists.freedesktop.org> on behalf of William Bader <williambader@hotmail.com><br> <b>Date: </b>Monday, June 11, 2018 at 7:02 AM<br> <b>To: </b>"poppler@lists.freedesktop.org" <poppler@lists.freedesktop.org><br> <b>Subject: </b>Re: [poppler] Color conversion while rendering for printing<o:p></o:p></span></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div id="divtagdefaultwrapper"> <p><span style="font-size:12.0pt;color:black">ghostscript had a similar issue with performance, and they added a -dUseFastColor to bypass ICC lookups. <a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ghostscript.com%2Fdoc%2F9.23%2FUse.htm%23EPS_parameters&data=02%7C01%7Clrosenth%40adobe.com%7C568c5e86e9ac4b0ade6208d5cfa404d5%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C636643225726934480&sdata=keEYP9Bj9FO796Mbqs0j8ktGGT4x3SD6yeE%2Fx7lvOnQ%3D&reserved=0">https://www.ghostscript.com/doc/9.23/Use.htm#EPS_parameters</a><o:p></o:p></span></p> <p><span style="font-size:12.0pt;color:black">They are also working on a fork of LCMS that is faster and thread-safe. <a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ghostscript.com%2Fdoc%2F9.23%2FHistory9.htm%23Version9.23&data=02%7C01%7Clrosenth%40adobe.com%7C568c5e86e9ac4b0ade6208d5cfa404d5%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C636643225726934480&sdata=Y0%2B4L3yXNhQkXUD4Q039N3252ntXBlssZ5VVNQlX3Uw%3D&reserved=0">https://www.ghostscript.com/doc/9.23/History9.htm#Version9.23</a><o:p></o:p></span></p> <p><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p> <p><span style="font-size:12.0pt;color:black">I think that only the final application to process the file should apply the color conversion. Viewers know that they are the final application. When poppler renders a document, it doesn't know if the results will be sent to another application, to a printer that will apply its own color conversion, or to a printer that will output it directly. That might be another reason to make it optional.<o:p></o:p></span></p> <p><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p> <p><span style="font-size:12.0pt;color:black">William<o:p></o:p></span></p> <p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p> <div> <div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:12.0pt;color:black"> <hr size="2" width="98%" align="center"> </span></div> <div id="divRplyFwdMsg"> <p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> poppler <poppler-bounces@lists.freedesktop.org> on behalf of Carlos Garcia Campos <carlosgc@gnome.org><br> <b>Sent:</b> Monday, June 11, 2018 9:10 AM<br> <b>To:</b> poppler@lists.freedesktop.org<br> <b>Subject:</b> [poppler] Color conversion while rendering for printing</span><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p> <div> <p class="MsoNormal"><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p> </div> </div> <div> <div> <p class="MsoNormal"><span style="color:black"><br> Hi,<br> <br> does it make sense to do color conversions using CMS while rendering<br> document for printing? I don't know much about CMS, I'm asking because<br> libcms is very very slow in some documents. When rendering individual<br> pages like viewers do, the slowdown is not that noticeable, but when<br> printing an entire document the slowdown is very annoying. I think we<br> could use the existing printing flag we pass when creating the GfxState<br> to not use CMS. <br> <br> Thanks,<br> -- <br> Carlos Garcia Campos<br> PGP key: <a href="https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpgp.mit.edu%3A11371%2Fpks%2Flookup%3Fop%3Dget%26search%3D0x523E6462&data=02%7C01%7Clrosenth%40adobe.com%7C568c5e86e9ac4b0ade6208d5cfa404d5%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C636643225726944489&sdata=2rB%2B8UnaCfV%2BY05XMm6kJtte8A7T65D4aXlusNr4inw%3D&reserved=0"> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x523E6462</a><o:p></o:p></span></p> </div> </div> </div> </div> </div> </body> </html>