mailing-list for TeXmacs Users

["Sam Liddicott" <address@hidden>]

On 11/05/11 19:39, Sam Liddicott wrote:
> I have a 48 page TeXmacs document, and many of which have images which 
> are screen-shots and so not very high resolution - I think all are 
> less than 800 pixels wide.
>
> The png image source directory and .tm file come to under 9MB, and the 
> document uses only about half of those images.
>
> The exported post-script is 280MB and the PDF is 40MB - which are 
> horrific sizes.
>
> (I'm using latest git repository from 
> git://gitorious.org/texmacs/texmacs.git)
>
> I tried compiling with --enable-pdf-renderer but then pdf export fails 
> with:
>
>
> ** WARNING ** Failed to load AGL file "pdfglyphlist.txt"...
> ** WARNING ** Failed to load AGL file "glyphlist.txt"...
> /home/sam/.TeXmacs/system/tmp/tmp_2009563087.pdf
> /home/sam/.TeXmacs/system/tmp/tmp_514256944.pdf
> ** ERROR ** TFM: Invalid TFM ID: -1
>
> Does anyone have any tips on reducing the PDF size? I tried changing 
> from 600dpi to 300dpi but it only saved 2MB on the PDF
>
> I'm quite certain from the PDF view (where the screen shots are a bit 
> washed out and have a funny interference pattern) that the images are 
> being scaled up and even screened in some way, which is why the post 
> script is so big.

Changing the dpi for the printer settings affected the relative size of 
the images in the document :-( so I had to change back.

Further examination lays the blame with pstopdf, although I guess a png 
decoder could have been embedded in the post-script which would have 
kept the .ps file small - and myabe the PDF small too, although I still 
have to investigate what the PDF is doing.

This link talks about png decoders in post-script.
http://www.tek-tips.com/viewthread.cfm?qid=1050035&page=7

Here is a slice of one of my  images:
  http://mail.liddicott.com/blotchy-2-orig.png

It looks just as fine in the post-script view.

And here is a screenshot from my PDF viewer at 400%
  http://mail.liddicott.com/blotchy-2.png

The areas of solid 24 bit colour have been dot-ified, some kind of 
hatching or other dithering it seems.

The change I observe may be different defaults for pstopdf as I have 
just upgraded my ubuntu release.

Sam