[NTG-context] Resolution of the images

Henning Hraban Ramm hraban at fiee.net
Mon Jan 16 17:22:43 CET 2006

Am 2006-01-16 um 12:22 schrieb Andreas Wapf:

> How does texexec --pdf file.tex includes the images into the target  
> pdf file?
> Does texexec process modify the images?
> What is the target resolution of the pdf?

- texexec, i.e. pdftex, just embeds images (also pdf) without  
changing them, besides scaling

- a PDF has no resolution, only some embedded contents may have any

> How should I optimize the process for digital or offset printing?

- define your colors in cmyk (at least *also*)

- prepare your pictures for the right resolution; if you need two  
versions (say web and print) you'd need to prepare both; you should  
name highres and lowres the same, only put them in different  
directories, so you could use mode sections that define the image path.

- the right resolution depends from the printing method and the  
a common rule of thumb for color and greyscale pictures is "twice the  
screen" (res. in dpi, screen in lpi), but \sqrt{2} would in fact be  
line art pictures should have the resolution of the printing device,  
but 800 dpi is mostly enough.

- if some elements should touch the paper border, they must "bleed"  
2-3 mm over to avoid white "flashers" after cutting; that contains  
that the printing paper sheet is bigger than your final paper size.

- you can prepare book(let) ordering of your pages with ConTeXt;  
that's called "imposition" in prepress and "arranging" in ConTeXt.

What else do you need to know?

Perhaps you're interested in my formula collection for printing  
(source is LaTeX, unfortunately)

Grüßlis vom Hraban!
http://www.cacert.org (I'm an assurer)

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