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List:       koffice
Subject:    Re: karbon
From:       Nicolas Goutte <nicolasg () snafu ! de>
Date:       2003-10-26 16:50:18
[Download RAW message or body]

If for you having the right resolution is more important than to have the real 
size, you can pre-process the print file by scaling 72/75 (or is it 75/72.)

CUPS has pre-process and post-process filters, I am quite sure that there is a 
Postscript manipulating tool that scales the PS file. (You will have to find 
out if you need it always or only for certain application/document/etc. So 
perhaps you would need two printer queues or however you do it correctly in 
CUPS.) Non-CUPS should be possible too, perhaps more complex to put in use.

However for most people it is the size that matters. So an inch should remain 
an inch and not 72/75 of it. That is why it is the job of the RIP.

As for Ghostscript, well, the version I use (7.05) tells that the generic 
printer driver still have known rasterising problems. So I do not know your 
version and I do not know if it was correct or not. (I also do not know if it 
is applies to the GImp drivers working for Ghostscript.)

Perhaps it would be helpful if you could tell which printer you have so that 
we can help you to get a better quality out of it. (You do not have access to 
a Xerox DC 70, that is for sure. But 600dpi covers a wide range of printers, 
even if limited to Laser, B/W, A4 or Letter, PCL-driven.)

If you are using CUPS, you could check in KDE what parameters are passed. 
Check especially if you are really printing in 600dpi or if your printer has 
finer modes.

Have a nice day!

On Friday 24 October 2003 10:56, James Richard Tyrer wrote:
> Nicolas Goutte wrote:
> > I think I start to understand what you want.
> >
> > As your printner is 600 dpi, you would want that (let name it so) the
> > grid is based also on 600dpi. But Postscript is not working that way.
> > PostScript is based on 72dpi (the point.) That is why all KOffice
> > application use the point as base.
>
> You probably wouldn't want to pick just any resolution, but PostScript
> allows decimal fractions so based on a points as the unit: 100 DPI is 0.72
> and 600 DPI is 0.12.  They are rational numbers in base 10 so there is no
> problem in PostScript.
>
> > Of course PS and also KOffice use floating points, but that is still not
> > making it 600dpi-based, however one turns that around. (360dpi, 720dpi
> > and 1440dpi are better values in this case, as there are multiples of
> > 72.)
>
> Yes those multiples clearly have an advantage.  But, most laser printers
> are still 75*N rather than 72*N. :-(
>
> > Sure in theory, this means a higher risk of moiré. However as far as I
> > know it is the job of the RIP to minimize that.
>
> AntiAliasing will help, but laser printers don't do that.  But there are
> the technologies that move the dots a small amount.

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