Re: CTP (see trapping/overprint without films)
Re: CTP (see trapping/overprint without films)
- Subject: Re: CTP (see trapping/overprint without films)
- From: Peter MacLeod <email@hidden>
- Date: Fri, 25 May 2001 16:44:03 -0700
At 11:16 AM +0200 5/25/01, Olaf Dr|mmer wrote:
I can only guess for the time being: I assume it is using the same
mechanism as for displaying/printing transparency (in the end
overprinting is just a special case of transparency). For displaying
transparency the answer clearly is: it depends. Simple vector overprints
will be done by vectors. Obviously this won't work for overprinting
images... I do not believe though that a whole page will be rasterized.
Rasterization will occur where finding vector graphics that do the trick
is too complex.
Olaf Druemmer
> --- Roberto Michelena wrote 5/24/01 4:21 PM: ---
>>- be printed out correctly on just about any clor printer if you turn on
>>preview overprints (or whatever that check box is actually called in the
>>advanced printing options).
>
>When you do that, does Acrobat rasterize the entire document (including
>fonts) and prints it as bitmap (ugh!), or only "flattens" the
>overprinting parts?
There's a setting in the advanced printing dialog (and the save to
PostScript or EPS settings dialog as well) which goes from "lowest/fastest"
to "highest/slowest". At "lowest/fastest" all transparent regions are
rasterized, and at "highest/slowest" all transparent regions are
decomposed so that simple regions can be emitted, i.e. it always
tries to keep everything as vector, no matter how complex the
document is. The settings in between move up the complexity
threshold at which it gives up and converts a given region to raster.
Previewed overprinting can be considered "transparent" for
this description. If you change the setting, there is a little
description displayed at each level which will explain it in more
carefully edited prose than I can provide here ;-)
--Peter