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<body class='hmmessage'><div dir='ltr'><br><br><div>> Date: Sun, 14 Feb 2016 08:46:55 +1300<br>> From: list0570@paradise.net.nz<br>> Subject: Re: [tex-k] patch to epstopdf<br>> To: karl@freefriends.org<br>> CC: williambader@hotmail.com; tex-k@tug.org<br>> <br>> On Thu 11 Feb 2016 08:11:38 NZDT +1300, Karl Berry wrote:<br>> <br>> > I attached a small patch to epstopdf that adds a "-gray" option to<br>> > produce a B&W PDF.<br>> ><br>> > Good idea, thanks!<br>> <br>> Not so fast. Can we please maintain the distinction between colour,<br>> grey, and monochrome? B&W refers to monochrome (1 bit), grey refers to<br>> 8 bit (or 16 bit), and colour to 24 or 48 bit. The file sizes behave<br>> accordingly, and compression ratios for monochrome are really good,<br>> unless files are contructed lazily as grey although only 1 bit of the 8<br>> bit storage width is actually used.<br>> <br>> So if adding an option for grey in a not very big patch, how about also<br>> adding an option for monochrome, like -mono or -bw, with the appropriate<br>> PS commands?<br>> <br>> Volker<br>> -- <br>> Volker Kuhlmann<br>> http://volker.top.geek.nz/ Please do not CC list postings to me.<br></div><div><br></div><div><br></div><div>My issue is that I am sending newspaper pages to an imager, and I don't want a color photo, for example, to trigger a CMYK separation on an interior page that can't print color. I am not doing the color to grayscale conversion to reduce the size.</div><div><br></div><div>I usually identify pages as either color or B&W, but I should have been more careful in the terminology.</div><div><br></div><div>In any case, I am not sure if ghostscript has an option to control the number of bits per sample. I tried a few options, but I still got 8 bit grayscale instead of 1 bit. The ghostscript pstopdf documentation is at <a href="http://www.ghostscript.com/doc/current/Ps2pdf.htm" target="_blank" style="font-size: 12pt;">http://www.ghostscript.com/doc/current/Ps2pdf.htm</a></div><div><br></div><div>If you can find a gs option that makes 1 bit B&W, I can revise my patch to add a -bw flag.</div><div><br></div><div>Regards, William</div><div><br></div><div><br></div><div><br></div> </div></body>
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