On Fri, Oct 31, 2003 at 12:21:48PM +0100, Michal Kvasnicka wrote:
> Good evening.
>
> I apologize to ask a little off-topic question, but I don't know where
> to ask (and it is closely related to TeX and PDF).
>
> I typeset a church bulleting. It is printed on a laserjet printer (600
> dpi), and then copied on a copy machine. As for letters, all is right.
> But figures (photos) are this way spoiled. I guess it would help either
> to force PDF to print the figures in some very low resolution (150 dpi),
> or (probably better) to dither the figures and include them in PNG
> (instead of ordinary JPEG). Can some of you tell me how to do it? I
> tried ImageMagick's convert to dither the photos, but outcomes were
> really poor. Is there some good free software for this (in the best case
> in Linux)? Or can I do it some way in PDF?
>
> Many thanks for any hint.
> Michal Kvasnicka
A PostScript solution: create a dvips header file for course
rasterization:
%!
/bop-hook {53 45{dup mul exch dup mul
add 1. exch sub}setscreen} def
These numbers (raster frequency and angle) are probably ok for
600dpi; otherwise, experiment a bit.
Call it coarse.pro and give dvips a parameter -h coarse.pro
--
Siep Kroonenberg
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