Re: Was: Opening external documents ... -> Can ConTeXt reduce size of images?

From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Cc: Matthias Weber <matweber@indiana.edu>
Subject: Re: Was: Opening external documents ... -> Can ConTeXt reduce size of images?
Date: Tue, 08 Jan 2013 02:09:09 +0100	[thread overview]
Message-ID: <50EB71B5.9030803@wxs.nl> (raw)
In-Reply-To: <46570E6F-7F3F-4D8A-81C2-DFFA1203431C@indiana.edu>

On 1/8/2013 1:00 AM, Matthias Weber wrote:

> So, this clearly is not a  ConTeXt problem. But it causes me major headaches. In my workflow, I have dozens of images
> that I prepare with Adobe Illustrator and save as pdf files that are still editable with Illustrator, i.e. that include another copy of the
> file with layers etc. In other words, my pdf images are about 10 times as big as they need to be. I usually just reduce the file size with preview.
> As this seems to be erroneous now, I am wondering:

it's even worse ... all kind of color and other data is present is such 
a file .. the pstopdf.rb script (comes with mkii) gets rid of some of that

normally at pragma we do such things either automatically (when graphics 
are put in repositories) or with acrobat in batch mode (doable if you 
get the graphics in advance) because doing such thing smanually for 
thousands of images is no fun

you can play with this:

\startluacode
local gsp = os.type == "windows" and "gswin32c" or "gs"
local gsc = "%s -q -dEPSCrop -sDEVICE=pdfwrite -dNOPAUSE -dSAFER 
-dNOCACHE -dBATCH -dProcessColorModel=/DeviceCMYK -sOutputFile=%s %s -c 
quit"
local pdp = "pdftops -eps %s %s"

figures.converters.pdf = {
     xxx = function(oldname,newname)
         local tmpname = oldname .. ".ps"
         local command = string.format(pdp,oldname,tmpname)
         os.execute(command)
         local command = string.format(gsc,gsp,newname,oldname)
         os.execute(command)
     end
}

figures.registersuffix("xxx","pdf")
\stopluacode

\starttext

\externalfigure[cow.pdf][conversion=xxx]

\stoptext

pdftops comes with xpdf (also in minimals)

if needed I can add a standard converter for it

Hans

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